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A method and device for determining a search space

A technology for searching space and determining units, which is applied in wireless communication, access restriction, network topology, etc., and can solve the problems of difficulty for users to receive data, starting position of search space, change of blind detection times of large and small mobile relays, and channel coherence time problems such as shortening

Active Publication Date: 2017-09-12
如东县升泰新农村开发建设有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large Doppler frequency offset caused by high-speed movement, and the OFDM system is extremely susceptible to the influence of frequency offset, that is, a small frequency offset will destroy the orthogonality between subcarriers, making it difficult for users to correct received data
In addition, the increase of Doppler frequency offset also shortens the channel coherence time, which leads to rapid changes in the wireless channel, which also seriously affects the correct reception of data
In order to solve the problem of correct reception of the downlink control channel, it is likely to introduce a new downlink control channel format, and the change of the value of the aggregation level L of R-PDCCH will lead to the starting position, size and moving of the R-PDCCH search space. The number of subsequent blind inspections changes
[0038] In this way, the existing method of determining the search space through the UE blind detection process is not suitable for mobile relay

Method used

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  • A method and device for determining a search space
  • A method and device for determining a search space
  • A method and device for determining a search space

Examples

Experimental program
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no. 1 example

[0097] In the first embodiment, in-band non-interleaving is the case where the starting positions of each search space are the same. In this embodiment, it is assumed that the mobile relay belongs to the in-band relay, and the R-PDCCHs of the mobile relays covered by the same base station are non-interleaved. The base station pre-configures 40 VRB pairs semi-statically for the mobile relay to carry the R-PDCCH by using high-level signaling, and the numbers are VRB0, VRB1, ..., VRB39 respectively. The 40 VRB pairs are logically continuous, but physically, they may be continuous or discrete depending on the way VRBs are mapped to PRBs.

[0098] The determination of each mobile relay search space includes:

[0099] If the value of Λ configured by the base station is {1, 2, 4, 8, 16, 32}, the number of corresponding R-PDCCH candidates is {6 or 8 or 10, 6 or 8 or 10, 2 or 3 or 4, 2 or 3 or 4, 1 or 2, 1}.

[0100] The starting positions of the search spaces corresponding to diffe...

no. 2 example

[0115] In the second embodiment, in-band non-interleaving is the case where the starting positions of each search space are different. In this embodiment, if the base station configures Λ to be {4, 8, 16, 32}, the numbers of corresponding R-PDCCH candidates are {2, 2, 1, 1}. The starting positions of the search spaces corresponding to different Λ are different, for example, the starting positions of the search spaces corresponding to Λ=4 are VRB28; the starting positions of the search spaces corresponding to Λ=8 are all VRB24; Λ=16 The starting position of the corresponding search space is VRB16; the starting position of the corresponding search space of Λ=32 is VRB0;

[0116] The specific blind inspection process is as follows:

[0117] The mobile relay performs detection in a group of 4-VRBs starting from Λ=4, and the corresponding R-PDCCH candidates are 2, that is, 2 detections in total;

[0118] The search spaces are: {{VRB28, VRB29, VRB30, VRB31}, {VRB32, VRB33, VRB34, ...

no. 3 example

[0126] The third embodiment, in-band interleaving. In this embodiment, it is assumed that the mobile relay belongs to the in-band relay, and the R-PDCCHs of the mobile relays covered by the same base station are interleaved with each other. At this time, the method for determining the search space is basically the same as the method for determining the search space of the UE in the current LTE / LTE-A. The difference is that the number of R-PDCCH candidates corresponding to L=16 is 1 or 2, and when L=32, the corresponding number of R-PDCCH candidates is 1.

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Abstract

The invention discloses a method and device for determining a search space, which includes obtaining the number of candidate control channels and their corresponding starting positions according to the degree of aggregation, and determining the search spaces corresponding to different degrees of aggregation; Blind detection of downlink control channels in the search space; wherein, when L or Λ=16, the number of corresponding candidate control channels is 1 or 2, and when L or Λ=32, the number of corresponding candidate control channels The number is 1; and, the starting positions of the search spaces corresponding to different L and Λ are fixed; or, they are semi-statically notified by high-layer signaling. The method of the invention solves the problem of how the mobile relay searches for its own downlink control channel in the high-speed mobile scene. It is well suited for mobile relays (or higher version terminals), which greatly simplifies the detection complexity of in-band / out-of-band relay nodes for their downlink control channels, and is well suited for relay nodes, saving The system overhead improves the transmission efficiency of the system.

Description

technical field [0001] The present invention relates, in particular, to a method and device for determining a search space of a downlink control channel of a mobile relay. Background technique [0002] The Long Term Evolution (LTE, Long Term Evolution) system, the Long Term Evolution Advanced (LTE-A, LTE-Advanced) system and the Advanced International Mobile Communication (IMT-Advanced, International MobileTelecommunication Advanced) system all use Orthogonal Frequency Division Multiplexing (OFDM , Orthogonal Frequency Division Multiplexing) technology; while the OFDM system is a time-frequency two-dimensional data form, a subframe (subframe) is composed of two slots (slots), when the normal cyclic prefix (Normal CP, Normal Cyclic Prefix), When each slot consists of 7 OFDM symbols to form an extended CP (Extended CP), each slot consists of 6 OFDM symbols. Wherein, the Physical Downlink Control Channel (PDCCH, Physical Downlink Control Channel) is located on the first 1 or 2...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W48/16
CPCH04W72/00H04W84/047
Inventor 袁明毕峰梁枫杨瑾吴栓栓
Owner 如东县升泰新农村开发建设有限公司
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