NAS協(xié)議解讀1.doc

1、 NAS消息類型：EPS mobility management message types和EPS session management message types（24301-a10（230頁）。2、 根據(jù)協(xié)議指示判斷是移動性管理消息和會話管理消息: Protocol discriminator（24007-900（100頁）if（pd=2）會話管理消息解碼（8.3節(jié)）else if（pd=7）移動性管理消息解碼（8.2節(jié)）3、 移動性管理消息解碼：u 協(xié)議指示（Protocol discriminator）+安全頭（Security header type）：1字節(jié)u 消息類型（Message type）：1字節(jié)u 其他字段解碼。4、 會話管理消息解碼：u 協(xié)議指示（Protocol discriminator）+承載ID（EPS bearer identity）：1字節(jié)u 過程事務(wù)ID（Procedure transaction identity）：1字節(jié)u 消息類型（Message type）：1字節(jié)u 其他字段解碼。注1：TLV（標(biāo)志，長度，值）注2：O：可選部分；M：必選固定；C：條件可選。Table 9.8.1: Message types for EPS mobility managementBits8765432101-EPS mobility management messages01000001Attach request01000010Attach accept01000011Attach complete01000100Attach reject01000101Detach request01000110Detach accept01001000Tracking area update request01001001Tracking area update accept01001010Tracking area update complete01001011Tracking area update reject01001100Extended service request01001110Service reject01010000GUTI reallocation command01010001GUTI reallocation complete01010010Authentication request01010011Authentication response01010100Authentication reject01011100Authentication failure01010101Identity request01010110Identity response01011101Security mode command01011110Security mode complete01011111Security mode reject01100000EMM status01100001EMM information01100010Downlink NAS transport01100011Uplink NAS transport01100100CS Service notification01101000Downlink generic NAS transport01101001Uplink generic NAS transportTable 9.8.2: Message types for EPS session managementBits8765432111-EPS session management messages11000001Activate default EPS bearer context request11000010Activate default EPS bearer context accept11000011Activate default EPS bearer context reject11000101Activate dedicated EPS bearer context request11000110Activate dedicated EPS bearer context accept11000111Activate dedicated EPS bearer context reject11001001Modify EPS bearer context request11001010Modify EPS bearer context accept11001011Modify EPS bearer context reject11001101Deactivate EPS bearer context request11001110Deactivate EPS bearer context accept11010000PDN connectivity request11010001PDN connectivity reject11010010PDN disconnect request11010011PDN disconnect reject11010100Bearer resource allocation request11010101Bearer resource allocation reject11010110Bearer resource modification request11010111Bearer resour