EP-3780865-B1 - NON-COMPETITIVE RANDOM ACCESS RESOURCE ALLOCATION METHOD, TERMINAL DEVICE AND NETWORK DEVICE

Inventors

• LIU, Siqi
• JI, Zichao
• ZHOU, JIANPING
• YANG, XIAODONG

Dates

Publication Date

20260506

Application Date

20190402

Claims (15)

1. A method for configuring a contention free random access resource, executed by a user equipment, comprising: receiving (501) target resource indication information, wherein the target resource indication information comprises a physical random access channel, PRACH, mask index; and determining (502) a target PRACH transmission occasion, RO, resource based on a value range of the PRACH mask index and a pre-defined mapping relationship, wherein the pre-defined mapping relationship comprises a correspondence between the value range of the PRACH mask index and an RO resource; characterized in that , the pre-defined mapping relationship is related to an RO resource group; the RO resource group is obtained by grouping, based on an association group, configured RO resources within a preset time interval; the association group is formed by RO resources needed for achieving a complete mapping between RO resources and associated objects, and the associated object is a synchronization signal block, SSB; the pre-defined mapping relationship comprises: in a case that the value range of the PRACH mask index is in an eighth preset interval, the corresponding RO resource comprises: all RO resources associated with a preset SSB, in a RO resource group having a preset serial number, wherein the preset serial number is determined according to a value of the PRACH mask index; in a case that the value range of the PRACH mask index is in a thirteenth preset interval, the corresponding RO resource comprises: an RO resource that is associated with a preset SSB and has a preset index number, in an RO resource group having a preset serial number, wherein the preset serial number is determined according to a value of the PRACH mask index.
2. The method according to claim 1, wherein the determining (502) the target RO resource based on the value range of the PRACH mask index and the pre-defined mapping relationship comprises: determining a candidate RO resource that matches the value range of the PRACH mask index based on the value range of the PRACH mask index and the pre-defined mapping relationship; in a case that the number of candidate RO resource is equal to one, determining the candidate RO resource as the target RO resource; in a case that the number of candidate RO resource is greater than one, selecting, based on a first preset rule, one or more RO resources from the candidate RO resources as the target RO resource; and in a case that the number of candidate RO resource is equal to zero, selecting, based on a second preset rule, one or more RO resources from configured RO resources within a preset time interval, as the target RO resource.
3. The method according to claim 2, wherein the selecting, based on the first preset rule, the one or more RO resources from the candidate RO resources as the target RO resource comprises: selecting, from the candidate RO resources, one or more available RO resources closer to a current time than any other in the candidate RO resources, as the target RO resource; or, selecting, from the candidate RO resources, a plurality of available RO resources in a manner of frequency division multiplex, FDM, in a frequency domain, as the target RO resource; or, selecting, from the candidate RO resources, a plurality of available RO resources in a manner of time division multiplex, TDM, in a time domain, as the target RO resource.
4. The method according to claim 2, wherein the selecting, based on the second preset rule, the one or more RO resources from the configured RO resources within the preset time interval, as the target RO resource comprises: selecting, from the configured RO resources within the preset time interval, one or more available RO resources closer to a current time than any other in the configured RO resources, as the target RO resource; or, selecting, from the configured RO resources within the preset time interval, a plurality of available RO resources in a manner of frequency division multiplex, FDM, in a frequency domain, as the target RO resource; or, selecting, from the configured RO resources within the preset time interval, a plurality of available RO resources in a manner of time division multiplex, TDM, in a time domain, as the target RO resource.
5. The method according to any one of claims 1 to 4, wherein the pre-defined mapping relationship is configured by the network device for the user equipment or specified by a protocol.
6. The method according to claim 5, wherein the pre-defined mapping relationship further comprises one or more of the following relationships: in a case that the value range of the target resource indication information is in a first preset interval, the corresponding RO resource comprises: all configured RO resources within a preset time interval by the network device; in a case that the value range of the target resource indication information is in a second preset interval, the corresponding RO resource comprises: an RO resource associated with a preset associated object, in an odd-numbered RO resource group; in a case that the value range of the target resource indication information is in a third preset interval, the corresponding RO resource comprises: an RO resource associated with a preset associated object, in an even-numbered RO resource group; in a case that the value range of the target resource indication information is in a fourth preset interval, the corresponding RO resource comprises: an RO resource that is associated with a preset associated object and has an odd index number, in an odd-numbered RO resource group; and an RO resource that is associated with a preset associated object and has an even index number, in an even-numbered RO resource group; in a case that the value range of the target resource indication information is in a fifth preset interval, the corresponding RO resource comprises: all RO resources associated with a preset associated object, in an i th subgroup of all RO resource groups, wherein i is determined according to a value of the target resource indication information, subgroups are obtained by equally dividing all the RO resource groups in sequence, and i is an integer greater than zero and less than or equal to the total number of the subgroups; in a case that the value range of the target resource indication information is in a sixth preset interval, the corresponding RO resource comprises: RO resources in a j th subgroup among all RO resources associated with a preset associated object, from all RO resource groups, wherein j is determined according to a value of the target resource indication information, subgroups are obtained by equally dividing all the RO resources associated with the preset associated object in sequence, and j is an integer greater than zero and less than or equal to the total number of the subgroups; in a case that the value range of the target resource indication information is in a seventh preset interval, the corresponding RO resource comprises: RO resources associated with a preset associated object, in a preset number of consecutive RO resource groups starting from a RO resource group having a preset serial number; in a case that the value range of the target resource indication information is in a ninth preset interval, the corresponding RO resource comprises: an RO resource that is associated with a preset associated object and has a preset index number, in all RO resource groups; in a case that the value range of the target resource indication information is in a tenth preset interval, the corresponding RO resource comprises: an RO resource that is associated with a preset associated object and has a preset index number, in an odd-number RO resource group; in a case that the value range of the target resource indication information is in an eleventh preset interval, the corresponding RO resource comprises: an RO resource that is associated with a preset associated object and has a preset index number, in an even-number RO resource group; in a case that the value range of the target resource indication information is in a twelfth preset interval, the corresponding RO resource comprises: an RO resource that is associated with a preset associated object and has a preset index number, in a k th subgroup of all RO resource groups, wherein k is determined according to a value of the target resource indication information, subgroups are obtained by equally dividing all resource groups in sequence, and k is an integer greater than zero and less than or equal to the total number of the subgroups; or, in a case that the value range of the target resource indication information is in a fourteenth preset interval, the corresponding RO resource comprises: an RO resource that is associated with a preset associated object and has a preset index number, in a preset number of consecutive RO resource groups starting from a RO resource group having a preset serial number.
7. The method according to claim 6, wherein the target resource indication information comprises the PRACH mask index and the method further comprises: determining the preset index number based on a value of a specified bit of the PRACH mask index and a value indicated by remaining bits of the PRACH mask index.
8. The method according to claim 7, wherein the specified bit is a most significant bit, and determining the preset index number based on the value of the most significant bit of the PRACH mask index and the value indicated by remaining bits of the PRACH mask index comprises: in a case that the most significant bit of the PRACH mask index is a first preset value, determining the value indicated by the remaining bits of the PRACH mask index as the preset index number; and in a case that the most significant bit of the PRACH mask index is a second preset value, determining a value other than the value indicated by the remaining bits of the PRACH mask index as the preset index number; wherein the first preset value and the second preset value are different.
9. A method for configuring a contention free random access resource, executed by a network device, comprising: transmitting (101) target resource indication information to a user equipment based on a pre-defined mapping relationship; wherein the target resource indication information comprises a physical random access channel, PRACH, mask index, and the pre-defined mapping relationship comprises a correspondence between a value range of the PRACH mask index and a PRACH transmission occasion, RO, resource; characterized in that , the pre-defined mapping relationship is related to an RO resource group; the RO resource group is obtained by grouping, based on an association group, configured RO resources within a preset time interval; the association group is formed by RO resources needed for achieving a complete mapping between RO resources and associated objects, and the associated object is a synchronization signal block, SSB; the pre-defined mapping relationship comprises: in a case that the value range of the PRACH mask index is in an eighth preset interval, the corresponding RO resource comprises: all RO resources associated with a preset SSB, in a RO resource group having a preset serial number, wherein the preset serial number is determined according to a value of the PRACH mask index; in a case that the value range of the PRACH mask index is in a thirteenth preset interval, the corresponding RO resource comprises: an RO resource that is associated with a preset SSB and has a preset index number, in an RO resource group having a preset serial number, wherein the preset serial number is determined according to a value of the PRACH mask index.
10. The method according to claim 9, wherein the pre-defined mapping relationship is predetermined by the network device or specified by a protocol.
11. The method according to claim 10, wherein the pre-defined mapping relationship further comprises one or more of the following relationships: in a case that the value range of the target resource indication information is in a first preset interval, the corresponding RO resource comprises: all configured RO resources within a preset time interval; in a case that the value range of the target resource indication information is in a second preset interval, the corresponding RO resource comprises: an RO resource associated with a preset associated object, in an odd-numbered RO resource group; in a case that the value range of the target resource indication information is in a third preset interval, the corresponding RO resource comprises: an RO resource associated with a preset associated object, in an even-numbered RO resource group; in a case that the value range of the target resource indication information is in a fourth preset interval, the corresponding RO resource comprises: an RO resource that is associated with a preset associated object and has an odd index number, in an odd-numbered RO resource group; and an RO resource that is associated with a preset associated object and has an even index number, in an even-numbered RO resource group; in a case that the value range of the target resource indication information is in a fifth preset interval, the corresponding RO resource comprises: all RO resources associated with a preset associated object, in an i th subgroup of all RO resource groups, wherein i is determined according to a value of the target resource indication information, subgroups are obtained by equally dividing all the RO resource groups in sequence, and i is an integer greater than zero and less than or equal to the total number of the subgroups; in a case that the value range of the target resource indication information is in a sixth preset interval, the corresponding RO resource comprises: RO resources in a j th subgroup among all RO resources associated with a preset associated object, from all RO resource groups, wherein j is determined according to a value of the target resource indication information, subgroups are obtained by equally dividing all the RO resources associated with the preset associated object in sequence, and j is an integer greater than zero and less than or equal to the total number of the subgroups; in a case that the value range of the target resource indication information is in a seventh preset interval, the corresponding RO resource comprises: RO resources associated with a preset associated object, in a preset number of consecutive RO resource groups starting from a RO resource group having a preset serial number; in a case that the value range of the target resource indication information is in a ninth preset interval, the corresponding RO resource comprises: an RO resource that is associated with a preset associated object and has a preset index number, in all RO resource groups; in a case that the value range of the target resource indication information is in a tenth preset interval, the corresponding RO resource comprises: an RO resource that is associated with a preset associated object and has a preset index number, in an odd-number RO resource group; in a case that the value range of the target resource indication information is in an eleventh preset interval, the corresponding RO resource comprises: an RO resource that is associated with a preset associated object and has a preset index number, in an even-number RO resource group; in a case that the value range of the target resource indication information is in a twelfth preset interval, the corresponding RO resource comprises: an RO resource that is associated with a preset associated object and has a preset index number, in a k th subgroup of all RO resource groups, wherein k is determined according to a value of the target resource indication information, subgroups are obtained by equally dividing all resource groups in sequence, and k is an integer greater than zero and less than or equal to the total number of the subgroups; or, in a case that the value range of the target resource indication information is in a fourteenth preset interval, the corresponding RO resource comprises: an RO resource that is associated with a preset associated object and has a preset index number, in a preset number of consecutive RO resource groups starting from a RO resource group having a preset serial number.
12. The method according to claim 11, wherein the target resource indication information comprises the PRACH mask index and the preset index number is determined based on a value of a specified bit of the PRACH mask index and a value indicated by remaining bits of the PRACH mask index.
13. The method according to claim 12, wherein the specified bit is a most significant bit, in a case that the most significant bit of the PRACH mask index is a first preset value, the preset index number is the value indicated by the remaining bits of the PRACH mask index; and in a case that the most significant bit of the PRACH mask index is a second preset value, the preset index number is a value other than the value indicated by the remaining bits of the PRACH mask index; and wherein the first preset value and the second preset value are different.
14. A network device (600), comprising: a transmitting module (601), configured to transmit target resource indication information to a user equipment based on a pre-defined mapping relationship; wherein the target resource indication information comprises a physical random access channel, PRACH, mask index, and the pre-defined mapping relationship comprises a correspondence between a value range of the PRACH mask index and an PRACH transmission occasion, RO, resource; characterized in that , the pre-defined mapping relationship is related to an RO resource group; the RO resource group is obtained by grouping, based on an association group, configured RO resources within a preset time interval; the association group is formed by RO resources needed for achieving a complete mapping between RO resources and associated objects, and the associated object is a synchronization signal block, SSB; the pre-defined mapping relationship comprises: in a case that the value range of the PRACH mask index is in an eighth preset interval, the corresponding RO resource comprises: all RO resources associated with a preset SSB, in a RO resource group having a preset serial number, wherein the preset serial number is determined according to a value of the PRACH mask index; in a case that the value range of the PRACH mask index is in a thirteenth preset interval, the corresponding RO resource comprises: an RO resource that is associated with a preset SSB and has a preset index number, in an RO resource group having a preset serial number, wherein the preset serial number is determined according to a value of the PRACH mask index.
15. A user equipment (700), comprising: a receiving module (701), configured to receive target resource indication information, wherein the target resource indication information comprises a physical random access channel, PRACH, mask index; and a first determining module (702), configured to determine a target PRACH transmission occasion, RO, resource based on a value range of the PRACH mask index and a pre-defined mapping relationship, wherein the pre-defined mapping relationship comprises a correspondence between the value range of the PRACH mask index and an RO resource; the pre-defined mapping relationship is related to an RO resource group; the RO resource group is obtained by grouping, based on an association group, configured RO resources within a preset time interval; the association group is formed by RO resources needed for achieving a complete mapping between RO resources and associated objects, and the associated object is a synchronization signal block, SSB; the pre-defined mapping relationship comprises: in a case that the value range of the PRACH mask index is in an eighth preset interval, the corresponding RO resource comprises: all RO resources associated with a preset SSB, in a RO resource group having a preset serial number, wherein the preset serial number is determined according to a value of the PRACH mask index; in a case that the value range of the PRACH mask index is in a thirteenth preset interval, the corresponding RO resource comprises: an RO resource that is associated with a preset SSB and has a preset index number, in an RO resource group having a preset serial number, wherein the preset serial number is determined according to a value of the PRACH mask index.

Description

TECHNICAL FIELD The present disclosure relates to the technical filed of communications, and in particular to methods for configuring a contention free random access resource, a user equipment and a network device. BACKGROUND In a long term evolution (Long Term Evolution, LTE) system, for a contention free random access procedure, a network device transmits, to a user equipment, information carrying a preamble index (preamble index) and a physical random access channel (Physical Random Access Channel, PRACH) mask index (mask index), to instruct the user equipment to transmit, on a PRACH resource indicated by the PRACH mask index, a preamble (preamble) corresponding to the preamble index, and the network device generally transmits the information to the user equipment through a physical downlink control channel (Physical Downlink Control Channel, PDCCH) or radio resource control (Radio Resource Control, RRC) signaling. In a new radio (New Radio, NR) system, multiple physical random access channel transmission occasions (PRACH transmission occasion, which also may be referred to as PRACH occasion) in a manner of frequency division multiplex (Frequency Division Multiplex, FDM) may be configured by a network device at a time instance (time instance). In addition, in a PRACH resource configuration period, there may be multiple time instances. The time instance may be a duration needed for transmitting a PRACH resource, or it may be referred to as a time domain resource position used to transmit a PRACH resource. For ease of description, the PRACH transmission occasion is abbreviated as RO. In addition, in the NR, there may be an association relationship between an RO resource and a synchronization signal block (Synchronization signal block, SSB, which may also be referred to as Synchronization signal/Physical broadcast signal block, SS/PBCH block), for example, an RO resource may be associated with multiple SSBs such as {1/8, 1/4, 1/2, 1, 2, 4, 8, 16} SSBs. For a contention free random access procedure, the RO resource may have an association relationship with a channel state information-reference signal (Channel State Information-Reference Signals, CSI-RS). Moreover, in a case that the total number of configured RO resources in a PRACH resource configuration period is greater than or equal to the number of RO resources needed for completing SSB-RO (or CSI-RS-RO) mapping for two times, the SSB-RO (or CSI-RS-RO) mapping may be repeated on these RO resources. To facilitate understanding, the SSB or CSI-RS associated with the RO resource is referred to as an associated object of the RO resource herein. At present, in a PRACH resource configuration period, a relatively large number of bits need to be used by the network device so as to clearly indicate each RO resource. For example, in a format of frequency division duplex (Frequency Division Duplex, FDD) in FR1 (Frequency Range1), if there are 140 time instances in a PRACH resource configuration period, and there are 8 RO resources at each time instance correspondingly, then 13 bits are needed to indicate 140*8 RO resources, 3 bits are needed to indicate serial numbers of the RO resources, and 8 bits are needed to indicate a PRACH mask index, so as to clearly indicate each RO resource. In a format of time division duplex(ing) (Time Division Duplex(ing), TDD) in FR2 (Frequency Range2), if there are 560 time instances in a PRACH resource configuration period, and there are 8 RO resources at each time instance correspondingly, then 13 bits are needed to indicate 560*8 RO resources, where 3 bits are used to indicate serial numbers of the RO resources, and 10 bits are needed to indicate a PRACH mask index, so as to clearly indicate each RO resource. However, the carrying capacity of a PDCCH is limited, and enough bits may not be able to be provided to make a clear indication of each RO resource. On the other hand, in a case that the amount of RO resources needed for a complete SSB-RO (or CSI-RS-RO) mapping is relatively small and if the amount of allocated time instances is relatively large, then tens or even hundreds of repeated mappings may be performed at these time instances, which results in only a few resources available for other uplink signals. Such a configuration manner has a great influence on uplink control and data transmission, thus the possibility of this configuration is very small. If PRACH resource indication information having a dozen of bits is specially introduced for this configuration, waste of bits may be caused. Therefore, it is needed to design a manner for flexibly indicating an available PRACH resource by using a small number of bits (for example, 4bit). "Discussion on non-contention based random access" (R2-1709259, 3GPP TSG-RAN WG2 Meeting #99, 21st-25th August 2017) discusses the non-contention based random in consistent with the running TS. For non-contention based random access, a set of dedicated RACH transmission occasions in time doma