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Content for  TR 25.700  Word version:  12.0.0

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1  ScopeWord‑p. 8

In the past few years, a considerable increase in number of users as well as offered traffic per user has been experienced in HSPA networks, both in the downlink and in the uplink.
In response to this, several features have been standardized in 3GPP. These include multi-carrier HSPA, downlink and uplink CELL_FACH state enhancements, and introduction of downlink and uplink MIMO. However, much of the focus has been on improving downlink performance and further enhancements are needed for the uplink to handle increasing traffic load as well as new traffic types.
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2  References

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
RP-122019: "Study on Further EUL Enhancements".
[3]
RFC 2616:  "Hypertext Transfer Protocol -- HTTP/1.1".
[4]
RFC 2507:  "IP Header Compression".
[5]
RFC 4996:  "RObust Header Compression (ROHC): A Profile for TCP/IP (ROHC-TCP)".
[6]
R1-131558: "Further Considerations for HSUPA Rate Adaptation", Ericsson, ST-Ericsson.
[7]
R1-122580: "SINR-based scheduling for UL MIMO", Nokia Siemens Networks.
[8]
R1-122581: "Simulation results for SINR-based scheduling for UL MIMO", Nokia Siemens Networks.
[9]
R1-122582: "SINR-Based scheduling for SIMO and CLTD transmission modes", Nokia Siemens Networks.
[10]
R1-131609: "Initial simulation results for SINR-based scheduling and TDM in HSUPA", Nokia Siemens Networks.
[11]
R1-130674: "Initial simulation results for SINR-based scheduling in HSUPA", Nokia Siemens Networks.
[12]
R1-132612: "Further Details on HSUPA Rate Adaptation", Ericsson, ST-Ericsson.
[13]
R1-132613: "Initial Link Simulation Results for HSUPA Rate Adaptation", Ericsson, ST-Ericsson.
[14]
RFC 1951:  "DEFLATE Compressed Data Format Specification version 1.3".
[15]
RFC 1952:  "GZIP file format specification version 4.3".
[16]
TR 36.814: "Evolved Universal Terrestrial Radio Access (E-UTRA); Further advancements for E-UTRA physical layer aspects".
[17]
R1-133929: "TP on link level simulation assumptions for Lean Carrier", Ericsson, ST-Ericsson.
[18]
R1-132611: "Initial Link Simulation Results for Dedicated Secondary Carrier", Ericsson, ST-Ericsson.
[19]
R1-132611: "Initial Link Simulation Results for Dedicated Secondary Carrier", Ericsson, ST-Ericsson.
[20]
TS 25.214: "Physical layer procedures (FDD)".
[21]
TS 25.101: "User Equipment (UE) radio transmission and reception (FDD)".
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3  Definitions and abbreviationsWord‑p. 9

3.1  Definitions

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply.
A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.

3.2  Abbreviations

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply.
An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
ACB
Access Class Barring
CLTD
Closed-Loop Transmit Diversity
CSS
Cascading Style Sheets
DSAC
Domain Specific Access Restriction
EAB
Extend Access Class Barring
E-TFC
E-DCH Transport Format Combination
EUL
Enhanced Uplink
HTML
Hypertext Markup Language
IFHO
Inter-Frequency Handover
ILPC
Inner Loop Power Control
IPDC
IP Data Compression
IPHC
IP Header Compression
LZMA
Lempel-Ziv-Markov chain algorithm
MRAB
Multi RAB
OLPC
Outer Loop Power Control
PPAC
Paging Permission with Access Control
RoT
Rise over Thermal
SD
Secondary stream ETFC Offset
SG
Serving Grant
SIMO
Single Input, Multiple Output
SINR
Signal to Interference-plus-Noise Ratio
T2P
Traffic to Pilot
TCP
Transmission Control Protocol
TBS
Transport Block Size
TEBS
Total E-DCH Buffer Status
UPH
UE Power Headroom
WiMAX
Worldwide Interoperability for Microwave Access
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4  Objectives of the Study on Further EUL enhancementsWord‑p. 10

This study should fulfill the following objective of identifying potential technical solutions for increasing the uplink capacity, coverage and end user performance (e.g. latency, achievable rates, etc.). The improvements should address following scenarios:
  • Improvements to uplink user plane cell capacity with high number of users (high priority).
  • Improvements to uplink coverage and latency (lower priority).
Currently identified areas include:
  1. Enabling high user bitrates in a mixed-traffic scenario by means of, e.g., a more efficient method of confining high-RoT operation to dedicated secondary carriers.
  2. Rate Adaptation to support improved power and rate control for high rates.
  3. Improvements to handling of dynamic traffic on EUL, e.g. more efficient grant handling, improvements to the handling of scheduled and non-scheduled data and control transmissions during bursty traffic, etc.
  4. Improvements to EUL coverage when using single RAB as well as various multi-RAB combinations.
  5. Improvements to current access control mechanism to provide efficient approach for UTRAN in case of uplink overload.
  6. Reduce UL control channel overhead for HSPA operation.
  7. Mechanisms to perform UL data compression between the UE and the RAN
    • Evaluate compression gains and performance benefits for different types of smartphone traffic. At least UL capacity, signalling load, UE battery and latency should be considered.
    • Mechanisms to selectively enable/disable data compression when traffic is compressible/uncompressible.
  8. Low-complexity uplink load balancing solutions, e.g. a fast uplink carrier switching in Cell_DCH state, especially for configurations where the downlink is configured in multicarrier operation while the uplink is in single carrier.
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