Book contents
- Frontmatter
- Dedication
- Contents
- Preface
- Acknowledgements
- List of abbreviations
- 1 Introduction
- 2 WCDMA in a nutshell
- 3 Spreading codes and modulation
- 4 Physical layer
- 5 RF aspects
- 6 Chip rate processing functions
- 7 Symbol rate processing functions
- 8 Layer 2 - medium access control (MAC)
- 9 Layer 2 - RLC
- 10 PDCP and BMC protocols
- 11 Layer 3 - RRC
- 12 Measurements
- 13 NAS
- 14 Idle mode functions
- Appendix
- References
- Index
9 - Layer 2 - RLC
Published online by Cambridge University Press: 05 October 2013
- Frontmatter
- Dedication
- Contents
- Preface
- Acknowledgements
- List of abbreviations
- 1 Introduction
- 2 WCDMA in a nutshell
- 3 Spreading codes and modulation
- 4 Physical layer
- 5 RF aspects
- 6 Chip rate processing functions
- 7 Symbol rate processing functions
- 8 Layer 2 - medium access control (MAC)
- 9 Layer 2 - RLC
- 10 PDCP and BMC protocols
- 11 Layer 3 - RRC
- 12 Measurements
- 13 NAS
- 14 Idle mode functions
- Appendix
- References
- Index
Summary
Introduction
The RLC protocol is a layer 2 protocol that provides a range of transport services between an RLC entity in the UE and a peer RLC entity in the RNC. There can be multiple instances of the RLC protocol active depending upon the number of services and control channels that are required for a specific UE. In this chapter we consider the structure and operation of the RLC. The configuration and operation of the RLC in the UE is well defined within the RLC specification [28]. The configuration and operation of the RLC within the UTRAN is less well defined in [28] and to some extent is open to proprietary implementation. In this chapter, therefore, we focus on the aspects that are well defined, namely those pertaining to the UE, and where possible we address issues relevant to the UTRAN.
Three transport modes can be provided by the RLC layer: the TM, UM and the AM. In the following sections we examine the details for each of the different modes, their likely use and some aspects of their protocols.
TM
Introduction
The TM is a single direction protocol that operates between a TM entity in the UE and a TM entity in the RNC. The TM entity can be characterised as shown in Table 9.1.
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- Information
- WCDMA Design Handbook , pp. 300 - 336Publisher: Cambridge University PressPrint publication year: 2005