CN-113923735-B - Apparatus and method for improving handover performance in a wireless communication system

Abstract

A baseband circuit that receives a signal including a plurality of synchronization signal blocks generated in a neighbor cell and a signal including a radio resource control parameter generated in a serving cell from an RFIC and is configured to process the signal including the plurality of synchronization signal blocks generated in the neighbor cell and the signal including the radio resource control parameter generated in the serving cell includes a memory, a controller configured to write/read data to/from the memory, and a signal processor controlled by the controller, wherein the controller sets a number of measurement target SSBs based on RRC parameters, wherein the signal processor checks validity of the set number of SSBs, and the controller stores valid SSB information in the memory based on the check result, verifies the number of valid SSBs based on the stored valid SSB information, and controls the signal processor based on the verification result or invalidates the neighbor cell such that the signal processor measures reference signal reception power of the neighbor cell.

Inventors

• Zheng Duohai
• Du Zhouxuan

Assignees

• 三星电子株式会社

Dates

Publication Date

20260505

Application Date

20210409

Priority Date

20200709

Claims (18)

1. 1. A baseband circuit within a terminal in a wireless communication system, the baseband circuit comprising: A memory; a controller configured to write/read data to/from the memory, and A signal processor controlled by the controller; Wherein, the The baseband circuit receives a first signal from a radio frequency integrated circuit, RFIC, of the terminal, wherein the first signal comprises a plurality of synchronization signal blocks, SSBs, generated in a neighboring cell among a plurality of cells of the wireless communication system, and receives a second signal comprising radio resource control, RRC, parameters generated in a serving cell among said plurality of cells, The controller sets the number of measurement target SSBs among the plurality of SSBs based on the RRC parameter, The signal processor checks the validity of the set number of SSBs, and The controller stores valid SSB information in the memory based on a check result for validity, checks the number of valid SSBs based on the stored valid SSB information, and controls the signal processor to measure or invalidate the reference signal received power RSRP of the neighboring cell based on a result of checking the number of valid SSBs, Wherein the controller invalidates the neighbor cell when the number of valid SSBs is 0, or The controller re-determines that an SSB having the maximum RS-SINR among the set number of SSBs is valid, stores the re-determined valid SSB information in a memory, and controls a signal processor to measure RSRP of the neighbor cell based on the stored SSB information.
2. 2. The baseband circuit of claim 1, wherein the controller controls the signal processor to measure a reference signal RS-signal-to-interference-and-noise ratio SINR RS-SINR of an nth SSB of the set number of SSBs, wherein 1≤n≤n, N is a natural number greater than or equal to 1, and N is the set number, Comparing the measured RS-SINR of the nth SSB with a preset reference value, Determining the validity of the nth SSB based on the comparison result, Determining whether to store the nth SSB information in the memory based on a result of the determination of the validity, and When n=n, the validity check of SSBs of the neighboring cells is terminated.
3. 3. The baseband circuit of claim 2, wherein the controller determines that the nth SSB is valid when the RS-SINR of the nth SSB is greater than the preset reference value, and And when the RS-SINR of the nth SSB is smaller than or equal to the preset reference value, the controller determines that the nth SSB is invalid.
4. 4. The baseband circuit of claim 2, wherein when the nth SSB is determined to be valid, the controller stores the nth SSB information in a memory, and When the nth SSB is determined to be invalid, the controller does not store the nth SSB information in a memory.
5. 5. The baseband circuit of claim 1, wherein the controller controls the signal processor to decode a physical broadcast channel PBCH of an nth SSB of the set number of SSBs, wherein 1N N, N is a natural number greater than or equal to 1, and N is the set number, Verifying whether decoding of the PBCH of the nth SSB is successful, Determining validity of the nth SSB based on a verification result for decoding, Determining whether to store the nth SSB information in the memory based on the determination result for validity, Verify if N is the same as N, and Based on the result of verifying whether N is the same as N, it is determined whether to terminate the validity check of SSBs for the neighboring cells.
6. 6. The baseband circuit of claim 5, wherein the controller determines that the nth SSB is valid when a decoding operation of the PBCH of the nth SSB is successful, and When the decoding operation of the PBCH of the nth SSB fails, the controller determines that the nth SSB is invalid.
7. 7. The baseband circuit of claim 5, wherein when the nth SSB is determined to be valid, the controller stores the nth SSB information in a memory, and When the nth SSB is determined to be invalid, the controller does not store the nth SSB information in a memory.
8. 8. The baseband circuit of claim 1, wherein when the number of valid SSBs is 1 or more, the controller controls the signal processor to measure RSRP of the neighboring cell based on the valid SSBs.
9. 9. The baseband circuitry of claim 1, wherein the RRC parameter comprises valid SSB bitmap information for the serving cell.
10. 10. The baseband circuit of claim 9, wherein a controller checks whether an mth SSB of the serving cell corresponding to an nth SSB of the set number of SSBs is on based on the valid SSB bitmap information of the serving cell, wherein m=n, 1N is a natural number of 1 or more, and N is the set number, Determining whether to measure RS-SINR of the nth SSB based on a result of checking whether the mth SSB is turned on, Based on the result of determining whether to measure the RS-SINR of the nth SSB, determining that the nth SSB is valid by controlling a signal processor, Determining whether to store the nth SSB information in a memory based on a result of the determination for the validity of the nth SSB, Check whether n=n, and When n=n, the validity check of SSBs of the neighboring cells is terminated.
11. 11. The baseband circuit of claim 10, wherein the controller determines that the nth SSB is valid without measuring RS-SINR of the nth SSB when an mth SSB of a serving cell is verified as on.
12. 12. The baseband circuit of claim 10, wherein when the mth SSB of the serving cell is verified to be off, the controller controls the signal processor to measure RS-SINR of the nth SSB, compare the measured RS-SINR of the nth SSB with a preset reference value, and determine validity of the nth SSB based on the comparison result.
13. 13. The baseband circuit of claim 12, wherein the controller determines that the nth SSB is valid when the RS-SINR of the nth SSB is greater than the preset reference value, and And when the RS-SINR of the nth SSB is smaller than or equal to the preset reference value, the controller determines that the nth SSB is invalid.
14. 14. The baseband circuit of claim 10, wherein when the nth SSB is determined to be valid, the controller stores the nth SSB information in a memory, and When the nth SSB is determined to be invalid, the controller does not store the nth SSB information in a memory.
15. 15. The baseband circuitry of claim 10, wherein, When N < N, the controller starts validity check of the (n+1) th SSB among the set number of SSBs by controlling the signal processor.
16. 16. The baseband circuit of claim 9, wherein a controller checks whether an mth SSB of the serving cell corresponding to an nth SSB of the set number of SSBs is on based on the valid SSB bitmap information of the serving cell, wherein m=n, 1N is a natural number of 1 or more, and N is the set number, Determining whether the PBCH of the nth SSB is to be decoded based on a result of checking whether the mth SSB is turned on, Based on the result of determining whether the PBCH of the nth SSB is to be decoded, determining that the nth SSB is valid by controlling a signal processor, Determining whether to store the nth SSB information in the memory based on a result of determining that the nth SSB is valid, Check whether n=n, and When n=n, the validity check of SSBs of the neighboring cells is terminated.
17. 17. The baseband circuit of claim 16, wherein when an mth SSB of the serving cell is verified as on, a controller determines that the nth SSB is valid without decoding a PBCH of the nth SSB.
18. 18. The baseband circuit of claim 16, wherein when the mth SSB of the serving cell is determined to be off, the controller controls the signal processor to cause the signal processor to decode the PBCH of the nth SSB, checks whether the decoding of the PBCH of the nth SSB is successful, and determines the validity of the nth SSB based on a check result for decoding.

Description

Apparatus and method for improving handover performance in a wireless communication system The present application is based on and claims priority of korean patent application No. 10-2020-0084939 filed in the korean intellectual property office on 7/9/2020, the disclosure of which is incorporated herein by reference in its entirety. Technical Field The present disclosure relates generally to wireless communications, and more particularly to improving handover performance in wireless communication systems. Background In order to meet the increasing demand for wireless data traffic since the commercialization of fourth generation (4G) communication systems, efforts have been made to develop and commercialize improved fifth generation (5G) communication systems (also referred to as New Radio (NR) systems). To achieve high data rates, 5G communication systems can be implemented with millimeter (mm) wave frequency band (e.g., about 28GHz or 60 GHz) operation. In order to reduce the path loss of radio waves in the millimeter wave band and increase the propagation distance of radio waves, in 5G communication systems, beamforming, massive Multiple Input Multiple Output (MIMO), full-dimensional (FD) MIMO (FD-MIMO), array antennas, analog beamforming, massive antenna techniques, and the like have been applied or will be applied. Further, in order to improve wireless communication system networks, in 5G communication systems, technologies such as evolved small cells, advanced small cells, cloud Radio Access Networks (RANs)), ultra dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, cooperative communication, cooperative multipoint (CoMP), and interference cancellation have been or will be applied. Further, for 5G, advanced Code Modulation (ACM) methods such as "hybrid frequency shift keying and quadrature amplitude modulation (FQAM)" and Sliding Window Superposition Coding (SWSC) and advanced access technologies such as Filter Bank Multicarrier (FBMC) and Sparse Code Multiple Access (SCMA) have been or will be applied. In an advanced wireless communication system, a terminal may measure a Reference Signal Received Power (RSRP) of a neighboring cell, wherein the neighboring cell is a cell located near a serving cell to which the terminal is communicatively connected. The RSRP measurement may be used to determine whether handover to a neighboring cell is appropriate. The terminal may send the measurement results as a measurement report to the serving cell. The serving cell may then send the measurement report to the core network, and the core network may determine whether a handover should occur based on the measurement report sent from the serving cell and similar measurement reports from neighboring cells. The core network may send the handover determination result to the serving cell and the associated neighbor cells. Each of the cells may then participate in a coordinated handover. However, according to circumstances, when RSRP of a neighboring cell is measured, there is a problem in that a specific signal transmitted by a serving cell may generate a large interference. In such a scenario, RSRP measurement accuracy may decrease, which may lead to unnecessary handover of the terminal. Such unnecessary handover may degrade the modem performance of the terminal and excessively consume network resources. Disclosure of Invention Embodiments of the inventive concept provide an apparatus and method for improving handover performance and stability by reducing unnecessary handovers. According to an aspect of the inventive concept, there is provided a baseband circuit, wherein the baseband circuit receives a signal including a plurality of Synchronization Signal Blocks (SSBs) generated in neighboring ones of a plurality of cells and a signal including Radio Resource Control (RRC) parameters generated in serving ones of the plurality of cells from a Radio Frequency Integrated Circuit (RFIC), and is configured to process a signal including a plurality of Synchronization Signal Blocks (SSBs) generated in neighboring ones of the plurality of cells and a signal including Radio Resource Control (RRC) parameters generated in serving ones of the plurality of cells, wherein the baseband circuit includes a memory, a controller configured to write data to or read data from the memory, and a signal processor controlled by the controller, wherein the controller sets a number of measurement target SSBs of the plurality of SSBs based on the RRC parameters, the signal processor checks validity of the set number of SSBs, and the controller stores valid SSB information based on a check result, and the stored SSB information based on the memory checks validity of the SSBs and invalidates the signal processor based on the stored valid SSBs or the measured signal. According to another aspect of the inventive concept, there is provided a terminal that receives a plurality of Synchronization Signal Blocks (SSBs