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EP-4738974-A2 - METHODS, TERMINAL DEVICE AND BASE STATION FOR RANDOM ACCESS PROCEDURE

EP4738974A2EP 4738974 A2EP4738974 A2EP 4738974A2EP-4738974-A2

Abstract

Methods, a terminal device and a base station for random access procedure are disclosed. According to an embodiment, the terminal device determines a frequency hopping configuration for transmission of one or more physical uplink shared channels (PUSCHs) in a request message for random access. The terminal device transmits the one or more PUSCHs in the request message based on the frequency hopping configuration. The request message at least comprises a physical random access channel (PRACH) preamble and the one or more PUSCHs.

Inventors

  • LIN, Zhipeng
  • BLANKENSHIP, YUFEI
  • HARRISON, ROBERT MARK
  • ZHANG, JIANWEI

Assignees

  • Telefonaktiebolaget LM Ericsson (publ)

Dates

Publication Date
20260506
Application Date
20200522

Claims (15)

  1. A method performed by a terminal device, comprising: determining (502) a frequency hopping configuration for transmission of one or more physical uplink shared channels, PUSCHs, in a request message for random access; and transmitting (504) the one or more PUSCHs in the request message based on the frequency hopping configuration, the request message at least comprising a physical random access channel, PRACH, preamble and the one or more PUSCHs.
  2. The method according to claim 1, wherein the frequency hopping configuration comprises one or more parameters indicating: enabling and/or disabling of frequency hopping; a starting physical resource block, PRB, for frequency hopping; a frequency offset for frequency hopping; a frequency hopping type which is one of intra-slot hopping, inter-slot hopping, intra-PUSCH occasions, POs, hopping and inter-POs hopping; a number of slots which the one or more PUSCHs span; and a redundancy version, RV, for the more than one PUSCHs.
  3. The method according to claim 1 or 2, wherein the frequency hopping configuration is determined based on a radio resource control, RRC, signaling.
  4. The method according to claim 3, wherein the RRC signaling is a cell-specific RRC signaling or an RRC signaling specific to the terminal device.
  5. The method according to claim 3 or 4, wherein the terminal device determines to disable frequency hopping when a frequency offset is not configured in the RRC signaling.
  6. The method according to claim 3 or 4, wherein the terminal device determines to disable frequency hopping when a frequency offset is set to zero in the RRC signaling.
  7. The method according to claim 2, wherein the one or more parameters in the frequency hopping configuration are determined as predetermined values.
  8. The method according to claim 2, wherein the one or more parameters in the frequency hopping configuration are determined based on a PRACH configuration for the PRACH preamble.
  9. The method according to claim 8, wherein the PRACH configuration for the PRACH preamble comprises one or more of: an extended PRACH configuration table from which one or more parameters in the frequency hopping configuration can be retrieved according to a PRACH configuration index; a number of PRACH occasions; a starting PRB of the PRACH preamble; and whether to perform the random access as contention based random access, CBRA, or contention free random access, CFRA.
  10. The method according to claim 2, wherein the one or more parameters in the frequency hopping configuration are determined based on one or more of: whether a cell serving the terminal device uses frequency division duplexing, FDD, or time division duplexing, TDD; different frequency bands in which the terminal device operates; whether a regular uplink carrier or a supplementary uplink carrier is to be used for the random access; whether the random access is to be performed in an initial active uplink bandwidth part, BWP; and a size of an active BWP.
  11. The method according to claim 10, wherein a frequency offset for frequency hopping is determined based on the size of the active BWP.
  12. A method performed by a base station, comprising: determining (602) a frequency hopping configuration to be used by a terminal device for transmission of one or more physical uplink shared channels, PUSCHs, in a request message for random access; and receiving (604) the one or more PUSCHs in a request message for random access based on the frequency hopping configuration.
  13. The method according to claim 12, wherein the frequency hopping configuration comprises one or more parameters indicating: enabling and/or disabling of frequency hopping; a starting physical resource block, PRB, for frequency hopping; a frequency offset for frequency hopping; a frequency hopping type which is one of intra-slot hopping, inter-slot hopping, intra-PUSCH occasions, POs, hopping and inter-POs hopping; a number of slots which the one or more PUSCHs span; and a redundancy version, RV, for the more than one PUSCHs.
  14. A terminal device (700) comprising: at least one processor (710); and at least one memory (720), the at least one memory (720) containing instructions executable by the at least one processor (710), whereby the terminal device (700) is operative to: determine a frequency hopping configuration for transmission of one or more physical uplink shared channels, PUSCHs, in a request message for random access; and transmit the one or more PUSCHs in the request message based on the frequency hopping configuration, the request message at least comprising a physical random access channel, PRACH, preamble and the one or more PUSCHs.
  15. A base station (700) comprising: at least one processor (710); and at least one memory (720), the at least one memory (720) containing instructions executable by the at least one processor (710), whereby the base station (700) is operative to: determine a frequency hopping configuration to be used by a terminal device for transmission of one or more physical uplink shared channels, PUSCHs, in a request message for random access; and receive the one or more PUSCHs in a request message for random access based on the frequency hopping configuration.

Description

Technical Field Embodiments of the disclosure generally relate to wireless communication, and, more particularly, to methods, a terminal device and a base station for random access procedure. Background This section introduces aspects that may facilitate better understanding of the present disclosure. Accordingly, the statements of this section are to be read in this light and are not to be understood as admissions about what is in the prior art or what is not in the prior art. In new radio (NR) system, a four-step approach as shown in FIG. 1 may be used for random access procedure. In this approach, the user equipment (UE) detects a synchronization signal (SS) and decodes the broadcasted system information (which may be distributed over multiple physical channels, e.g. physical broadcast channel (PBCH) and physical downlink shared channel (PDSCH)) to acquire random access transmission parameters, followed by transmitting a physical random access channel (PRACH) preamble (message 1 simply referred to as msg1) in the uplink. The next generation node B (gNB) detects the message 1 and replies with a random access response (RAR, message 2 simply referred to as msg2). The UE then transmits a UE identification (message 3 simply referred to as msg3) on physical uplink shared channel (PUSCH). Then the gNB transmits a contention resolution message (CRM, message 4 simply referred to as msg4) to the UE to solve conflict caused when multiple UEs transmit the same PRACH preamble. Summary This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter. One of the objects of the disclosure is to provide another solution for random access procedure. According to a first aspect of the disclosure, there is provided a method performed by a terminal device. The method comprises determining a frequency hopping configuration for transmission of one or more physical uplink shared channels (PUSCHs) in a request message for random access. The method further comprises transmitting the one or more PUSCHs in the request message based on the frequency hopping configuration. The request message at least comprises a physical random access channel (PRACH) preamble and the one or more PUSCHs. In an embodiment of the disclosure, the frequency hopping configuration may comprise one or more parameters indicating: enabling and/or disabling of frequency hopping; a starting physical resource block (PRB) for frequency hopping; a frequency offset for frequency hopping; a frequency hopping type which is one of intra-slot hopping, inter-slot hopping, intra-PUSCH occasions (POs) hopping and inter-POs hopping; a number of slots which the one or more PUSCHs span; and a redundancy version (RV) for the more than one PUSCHs. In an embodiment of the disclosure, the frequency hopping configuration may be determined based on a radio resource control (RRC) signaling. In this way, the PUSCH(s) for the request message of random access can be transmitted with proper frequency hopping configuration. In an embodiment of the disclosure, the RRC signaling may be a cell-specific RRC signaling or an RRC signaling specific to the terminal device. In an embodiment of the disclosure, the terminal device may determine to disable frequency hopping when a frequency offset is not configured in the RRC signaling. In an embodiment of the disclosure, the terminal device may determine to disable frequency hopping when a frequency offset is set to zero in the RRC signaling. In an embodiment of the disclosure, the one or more parameters in the frequency hopping configuration may be determined as predetermined values. In this way, the PUSCH(s) for the request message of random access can be transmitted with proper frequency hopping configuration. In an embodiment of the disclosure, the one or more parameters in the frequency hopping configuration may be determined based on a PRACH configuration for the PRACH preamble. In this way, the PUSCH(s) for the request message of random access can be transmitted with proper frequency hopping configuration. In an embodiment of the disclosure, the PRACH configuration for the PRACH preamble may comprise one or more of: an extended PRACH configuration table from which one or more parameters in the frequency hopping configuration can be retrieved according to a PRACH configuration index; a number of PRACH occasions; a starting PRB of the PRACH preamble; and whether to perform the random access as contention based random access (CBRA) or contention free random access (CFRA). In an embodiment of the disclosure, the terminal device may determine to enable frequency hopping when the number of PRACH occasions takes a predetermined value. In an embodiment of the disclosure, a frequency offs