Design of Downlink Broadcast Control Channel for 802

Design of Downlink Broadcast Control Channel for 802. 16 m Document Number: S 80216 m-08/140 Date Submitted: 2008 -03 -14 Source: Yih-Shen Chen, I-Kang Fu, Kelvin Chou, Dora Chen and Paul Cheng Voice: +886 -3 -5670766 E-mail: yihshen. chen@mediatek. com, IK. Fu@mediatek. com, Paul. Cheng@mediatek. com Media. Tek Inc. Venue: IEEE session #54, Orlando, FL. Base Contribution: C 80216 m-08/140. Purpose: For discussion on the downlink control channel issues and adoption on proposed text to SDD by TGm Notice: This document does not represent the agreed views of the IEEE 802. 16 Working Group or any of its subgroups. It represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802. 16. Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: <http: //standards. ieee. org/guides/bylaws/sect 6 -7. html#6> and <http: //standards. ieee. org/guides/opman/sect 6. html#6. 3>. Further information is located at <http: //standards. ieee. org/board/pat-material. html> and <http: //standards. ieee. org/board/pat >. 1

Motivation • The acquisition of DCD/UCD are required for initial network entry procedure – The current DCD/UCD broadcast cycle is long and inefficient • The longest duration could be 10 s • The whole DCD/UCD table should be re-broadcasted if any parameter is updated • In 802. 16 m SRD, the maximal state transition latency from idle mode to active mode is 100 ms – A new method for broadcasting system information is required 2

Introduction • The content of DCD/UCD: – Network entry related: BSID, frame duration, ranging code allocation and etc – Others: handover parameters, measurement parameters and etc • The characteristics of the content of DCD/UCD: – static/semi-static: BSID, frame duration, HARQ parameters, handover parameters and etc – dynamic: UL loading, contention backoff number and etc • An efficient broadcast control channel (BCH) is proposed to broadcast and update the parameters efficiently – Basic DCD/UCD and sub-DCD/sub-UCD – Additionally, scheduling information block (SIB) is employed to announce the information updating in a broadcast cycle 3

Categorization of System Information in DCD/UCD • the system information is generally categorized into a basic-DCD (basic-UCD) and multiple of sub-DCDs (sub-UCDs) – basic-DCD/basic-UCD: the necessary information required for network entry – sub-DCD/sub-UCD: a set of parameters for other specific functions 4

Example of DCD/UCD Categorization basic-DCD system frame number BW info. frame Configuration, TTG/RTG ranging downlink burst profile etc sub-DCD 1 static parameters for DL data transmission sub-DCD 2 dynamic parameters for DL data transmission sub-DCD 3 parameters for handover procedure …. … basic-UCD uplink burst profile permutation ranging code etc sub-UCD 1 static parameters of UL transmission sub-UCD 2 dynamic parameters of UL transmission sub-UCD 3 parameters for special subchannel configuration sub-UCD 4 parameters for measurement report … … The detail categorization is FFS. 5

Downlink Broadcast Control Channel • The DCD/UCD are broadcasted via super. MAP at the first frame of a superframe • A SIB announce the information scheduling for a broadcast cycle – The basic-DCD/basic-UCD appear every 20 ms – The sub-DCDs/sub-UCDs appear dynamically 6

Downlink Broadcast Control Channel • SIB appears in the super. MAP of the first superframe of a broadcast cycle – MAC management message may also be included • Benefits of SIB: – MS can expect when a certain system information can be received – MS may choose to skip some unwanted or duplicate system information 7

Text Proposal • Add the description of downlink broadcast control channel to TGm SDD [5] …… 10 Media Access Control Sub-Layer 10. x Downlink broadcast control channel • Add the two figures in the section 10. x Figure y: downlink broadcast control channel Figure z: An example of SIB message 8