001_trista_sounding reference signal resource in l12a

Sounding Reference Signal Resource in L12A

CBC/PR/N2 Trista Wu

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Sounding Reference Signal Resource | Ericsson Internal | 2012-02-23 |

Agenda

› Overview› Parameters for SRS› Setting and Limitation in L12A› Appendix


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Overview

› Reference Signal in Uplink Demodulation RS Sounding RS


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Parameters for SRS


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Frequency Division Multiplexing

› 3GPP 36.211– Take BW=10MHz for example


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Csrs=0, 40< PRB <60

•Tree-Like Structure, for instance:

- Only 1 UE can be scheduled with SRS if Bsrs=0 is configured (if Time/Code domain and Comb are not considered)

- 1 UE configured with Bsrs=1 and 6 UEs with Bsrs=3 can be scheduled with SRS (if Time/Code domain and Comb are not considered)

•PRB #0 and #49 are not used for SRS.

•PRBs in same color can be scheduled for one UE with corresponding Bsrs.

- Which specific set of PRBs will be scheduled will be determined by other parameters also, for instance, FrequencyDomainPosition.


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Wideband and Narrowband SRS

› Advantage for each case:


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Hopping


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Time Division Multiplexingsrs-SubframeConfig

› 3GPP 36.211


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Time Division Multiplexingsrs-ConfigIndex

› 3GPP 36.213


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srs-SubframeConfig=3, srs-ConfigIndex = 2

› Example:› srs-SubframeConfig=3

› srs-ConfigIndex = 2

}0{

5SFC

SFC

T

0offset T

SRS is transmitted in the last symbol of the subframes determined by srs-SubframeConfig and srs-ConfigIndex.


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Code Division Multiplexing

› Different cyclic shifts of the same ZC-based sequence to achieve orthogonal separation (zero or low correlation)

› For terminals with code division multiplexing SRS, multiple SRS need to be transmitted in parallel in the same subframe and span the same frequency band. Example: cyclicShift = cs0


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Collision Management


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Scenarios of when SRS is not preferred

› For following scenarios, uplink diversity can be used instead of SRS, for instance, frequency-hopping The overhead from channel sounding is too costly

• In the worst-case, sounding overhead can be up to 7% (with ∼an SRS symbol in every subframe).

The variations in the channel are too rapid to be tracked, for example, at high terminal speeds.


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L12A Setting for SRS

› Hard-Coded Parameters


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L12A Restriction for SRS› According to SRS setting in L12A, there should be at most 32 SRS resource

available for 10MHz BW – Maximum value for systemconstant 424 <srsCodeMultiplexingCapacity> is 4, which means at

most 4 cyclic shift codes can be used for SRS– Maximum value for systemconstant 425 <maxNrOfSrsUsersPerNormalSymbolAndBbm2Rx> is

32, which stands for the number of SRS users for 2 RX antenna

› However, with changing SC 425 to a value larger than default value 3, for instance, 8 or 32, eNodeB restart automatically with llog as follows:

---------------------------------------------------------------------------- 5. Time : 11-12-29, 10:31:04 Error code : 0xB0AD0005 (Reported via CELLO:ERI IF) Process : bmMpRole Queued signals : 0 Owned signals : 4 Restart type : Processor OS Run Mode : BASIC PMD identity : - Restart rank : Warm Error Information: Board manager restart escalate. Program restart limit (1) exceeded: lmid=CXC1725398%14_R14AH

› According to the test result, we can have at most 3 SRS resources scheduled for 10MHz BW. – This could be limited by the processing capability of SRS in the same subframe.


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AppendixRRC Message Sample (BW: 10MHz)

001_trista_sounding reference signal resource in l12a

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