High-gain beam handover
地域：
Stockholm
摘要
In one aspect, a network (e.g., a TRP) (150) uses handover triggering information to detect whether a handover triggering condition is present before a radio link fails, and initiates a handover upon detecting the handover triggering condition. In another aspect, a target TRP (152) is provided with beam generating information that enables the target TRP (152) to produce a high-gain beam for use in communicating with a UE (101) without having to perform a beam refinement procedure.
說明書
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This application is a 35 U.S.C. § 371 National Stage of International Patent Application No. PCT/SE2017/050978, filed Oct. 6, 2017, and designating the United States.
Disclosed are embodiments related to handover of a user equipment (UE) in a wireless communication system employing high-gain beams.
The next generation mobile wireless communication system, which is referred to as “5G,” will support a diverse set of use cases and a diverse set of deployment scenarios. 5G will encompass an evolution of today's 4G networks and the addition of a new, globally standardized radio-access technology known as “New Radio” (NR).
The diverse set of deployment scenarios includes deployment at both low frequencies (100s of MHz), similar to LTE today, and very high frequencies (mm waves in the tens of GHz). At high frequencies, propagation characteristics make achieving good coverage challenging. One solution to the coverage issue is to employ beamforming (e.g., high-gain beamforming) to achieve satisfactory link budget.
Beamforming (or, more generally, precoding) is an important technology in future radio communication systems. It can improve performance both by increasing the received signal strength, thereby improving the coverage, and by reducing unwanted interference, thereby improving the capacity. Beamforming can be applied both in a transmitter and a receiver.
權(quán)利要求
The invention claimed is:1. A handover method in a wireless communication system comprising a source transmission and reception point (TRP) and a target TRP, the method comprising:the source TRP obtaining first handover triggering information identifying a first handover triggering condition, the first handover triggering information comprising first beam information indicating a first set of beam characteristics; the source TRP communicating with a user equipment (UE) using a high-gain beam having a second set of beam characteristics; the source TRP obtaining second beam information indicating the second set of beam characteristics; the source TRP determining whether the first handover triggering condition is present; and as a result of determining that the first handover triggering condition is present, the source TRP initiating a handover of the UE from the source TRP to the target TRP, wherein determining whether the first handover triggering condition is present comprises determining whether the second set of beam characteristics of the high-gain beam that is being used by the source TRP to communicate with the UE matches the first set of beam characteristics. 2. The method of claim 1 , whereinthe first beam information comprises first beam direction information, the second beam information comprises second beam direction information indicating the direction of the high-gain beam that is being used to communicate with the UE, determining whether the second set of beam characteristics matches the first set of beam characteristics comprises determining whether the second beam direction information is substantially identical to the first beam direction information. 3. The method of claim 2 , whereinthe first beam direction information comprises a first beam vector indicating a first direction, the second beam direction information indicating the direction of the high-gain beam that is being used to communicate with the UE comprises a second beam vector indicating the direction of the high-gain beam, and determining whether the second beam direction information is substantially identical to the first beam direction information comprises comparing the first beam vector with the second beam vector. 4. The method of claim 3 , whereinthe first set of beam characteristics comprises at least one of: a first modulation and coding scheme (MCS) and a first information, the second set of beam characteristics further comprises at least one of a second MCS and a UE reported information, determining whether the second set of beam characteristics matches the first set of beam characteristics further comprises at least one of: determining whether the first MCS is substantially identical to the second MCS and determining whether the first information is substantially identical to the UE reported information, and the UE reported information is one or more of: a CQI, a PMI, an RI, an RSRP value, an RSRQ value, PTI, RS SINR, PHR information, TA information, block error information, bit error information, subframe timing difference, and RS time difference, and time alignment information. 5. The method of claim 1 , whereinthe first handover triggering information is associated with beam generating information for use in producing a high-gain beam, and the step of initiating the handover of the UE from the source TRP to the target TRP comprises transmitting the beam generating information to the target TRP. 6. The method of claim 5 , further comprisingthe target TRP receiving the beam generating information; and the target TRP using the received beam generating information to produce a high-gain beam for communicating with the UE. 7. The method of claim 6 , wherein the beam generating information comprises a high-gain beam vector. 8. The method of claim 6 , wherein the beam generating information comprises an index value for enabling the target TRP to retrieve a high-gain beam vector. 9. The method of claim 1 , wherein obtaining first handover triggering information comprises the source TRP obtaining from a learning function a data set comprising the first handover triggering information. 10. The method of claim 1 , whereinthe first set of beam characteristics comprises a first modulation and coding scheme (MCS), the second set of beam characteristics further comprises a second MCS, determining whether the second set of beam characteristics matches the first set of beam characteristics comprises determining whether the first MCS is substantially identical to the second MCS. 11. A source transmission and reception point (TRP), the source TRP comprising:a data storage system comprising a memory; and processing circuitry coupled to the data storage system, wherein the source TRP is configured to: obtain first handover triggering information identifying a first handover triggering condition, the first handover triggering information comprising first beam information indicating a first set of beam characteristics; communicate with a user equipment (UE) using a high-gain beam having a second set of beam characteristics; obtain second beam information indicating the second set of beam characteristics; determine whether the first handover triggering condition is present; and initiate a handover of the UE from the source TRP to a target TRP as a result of determining that the first handover triggering condition is present, wherein the source TRP is configured to determine whether the first handover triggering condition is present by performing a process comprising determining whether the second set of beam characteristics of the high-gain beam that is being used by the source TRP to communicate with the UE matches the first set of beam characteristics.
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