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Method for determining reference symbol

A technology for reference symbols and determination methods, applied in pilot signal allocation, digital transmission systems, electrical components, etc., can solve problems such as limited uplink resource scheduling, impact of system uplink throughput, and no allocation of MU-MIMO resources

Inactive Publication Date: 2011-09-28
BEIJING SAMSUNG TELECOM R&D CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this will lead to limited scheduling of uplink resources, which in turn will affect the uplink throughput of the entire system
[0008] In the LTE-A system, higher requirements are put forward for the uplink throughput and spectrum efficiency of the entire system. In order to meet the new requirements of LTE-A, LTE-A UE supports multiple antennas to send uplink data; at the same time, in order to improve The utilization rate of the existing uplink wireless resources, however, the LTE-A system does not provide MU-MIMO resource allocation with unequal bandwidth, such as Figure 2c The method for determining the reference symbol by the UE shown

Method used

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Examples

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Embodiment 1

[0041] In this embodiment, if the cell identification number There are only UE1 and UE2 in the cell in , where UE1 and UE2 share 5 PRBs in the same subframe, for example, the subframe numbered i is 6, that is, PRB 0 to PRB 4 The 2 PRBs in the transmit uplink data; for example, UE1 occupies the PRB 0 ~PRB 1 , UE2 occupies PRB 0 ~PRB 4 ; In order to ensure that UE1 and UE2 are in the PRB 0 ~PRB 1 Orthogonality of reference symbols for eNB demodulation, the embodiment of the present invention provides the following Figure 4 The shown process may specifically include the following steps:

[0042] Step 401, UE1 receives cell system signaling, and obtains the common reference symbol group shared by all UEs in the current cell and instruction information of sequence frequency modulation from the received cell system signaling.

[0043] Here, the indication information of the reference symbol group and sequence frequency modulation in step 401 can be respectively passed thro...

Embodiment 2

[0058] In this embodiment, if the cell identification number There are UE3 and UE4 in the cell in , where UE3 and UE4 share 4 PRBs in the same subframe, such as the subframe with the number i being 8, that is, the PRB 0 to PRB 3 2 PRBs in the transmission of uplink data; for example, UE3 occupies the PRB 0 ~PRB 1 , UE4 occupies PRB 0 ~PRB 3 ; In order to ensure that UE3 and UE4 are in the PRB 0 ~PRB 1 Orthogonality of reference symbols for eNB demodulation, the embodiment of the present invention provides the following Figure 6 The shown process may specifically include the following steps:

[0059] Step 601, UE3 receives cell system signaling, and obtains the common reference symbol group shared by all UEs in the current cell and indication information of sequence frequency modulation from the received cell system signaling.

[0060] Similar to that described in step 401, the indication information of the reference symbol group and sequence frequency modulation in s...

Embodiment 3

[0071] In this embodiment, it mainly focuses on the case of dual antennas, and the principles of other cases such as multiple data streams are similar, and will not be described in detail here. If the cell identification number There are UE5 and UE6 in the cell in , where UE5 and UE6 share 5 PRBs in the same subframe, such as the subframe with the number i being 12, that is, the PRB 0 to PRB 4 2 PRBs in the UL to send uplink data; for example, UE5 occupies the PRB 0 ~PRB 1 , UE6 occupies PRB 0 ~PRB 4 ; In order to ensure that UE5 and UE6 are in the PRB 0 ~PRB 1 Orthogonality of reference symbols for eNB demodulation, this embodiment needs to indicate that there is no group hopping and sequence hopping of reference symbols in two consecutive time slots in the i=12th subframe of UE5 and UE6, correspondingly, in the i-th subframe = In 12 subframes, the eNB uses DCI to schedule UE5 to send multi-layer data on two PRBs. Here, this embodiment is similar to Embodiment 1. When...

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Abstract

The invention provides a method for determining a reference symbol, comprising the following steps: A, UE (User Equipment) obtains group frequency hopping information and / or sequence frequency hopping information of the reference symbol from cell system information broadcasted by an eNB (enhanced node base station); B, the UE receives dedicated control information which is sent to the UE by the eNB; C, the UE generates a reference symbol in a first time slot according to the group frequency hopping information and / or sequence frequency hopping information of the reference symbol obtained in the step A; and D, if the dedicated control information indicates that the group frequency hopping and / or sequence frequency hopping of the reference symbol is not activated, keeping a reference symbol in a second time slot and the reference symbol in the first time slot in the same sub-frame. By means of the method disclosed by the invention, the UE can be used for determining the reference symbol in a cell when a plurality of UE share a physical resource block.

Description

technical field [0001] The invention relates to mobile communication technology, in particular to a method for determining reference symbols. Background technique [0002] The LTE system includes two types of frame structures, namely the frame structure under the LTE Frequency Division Duplex (FDD) system and the frame structure under the LTE Time Division Duplex (TDD) system, Figure 1a and Figure 1b Schematic diagrams of the two frame structures are given respectively. [0003] Figure 1a Shows the radio frame structure under the LTE FDD system, in Figure 1a , the time length of the wireless frame is 307200×T s = 10ms, which contains 20 lengths of 15360T s The time slots = 0.5 ms are indexed 0 to 19. Each time slot includes a plurality of OFDM symbols. Here, each OFDM symbol has a cyclic prefix (CP). There are two ways to implement the CP, that is, a general CP and an extended CP. A time slot using a normal CP includes 7 OFDM symbols, and a time slot using an extende...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W72/12H04B1/713
CPCH04J13/22H04L5/0051H04W72/042H04L5/0023H04L5/0048H04W72/23
Inventor 何宏李迎阳孙程君
Owner BEIJING SAMSUNG TELECOM R&D CENT
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