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EVDO呼叫流程


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EV-DO 呼叫流程

Alcatel-Lucent CDMA2000 1X Data Strategy
All Rights Reserved Alcatel-Lucent 2007

目标
EV-DO 呼叫流程 12

培训结束时,参加人员能够: 深入理解EV-DO中的Session,Connection,PPP等概念; 呼叫处理体系结构; 掌握基本的空中接口消息; 掌握基本的呼叫流程,如Session建立,切换信令流程等.

0.5 day

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目录
EV-DO 呼叫流程 13

1 Session,Connection,RP Session和PPP Session 2 呼叫处理体系结构 3 广播消息 4 基本呼叫流程

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EV-DO 呼叫流程

14

1. Session,Connection,RP Session,PPP Session

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目录
EV-DO 呼叫流程 15

Session Connection RP Session PPP Session

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Session

EV-DO 呼叫流程

16

Session的相关定义 (1) Session是保持在AT和AN端共享的状态,比如AT和AN之间共同所 使用的协议信息,一个Session会有多个Connection (2) AT的标识:UATI (Unicast Access Terminal Identifier),UATI唯一 标识一个AT (3) UATI由RNC分配并且保持不变,直到AT离开该RNC的覆盖范围或 者Keep Alive Timer超时 (4) UATI由AT申请,由RNC分配 (5) 只要AT开机,就会申请UATI,所有开机的AT都存在一个UATI, 独立于连接和PPP

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Session

EV-DO 呼叫流程

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UATI格式 (1) Color Code唯一代表一个RNC (2) UATI24代表UATI的低24位 (3) UATI24 + Color Code 组成呼叫ID并且唯一代表一个AT

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Session

EV-DO 呼叫流程

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Session周期 (1) Session周期由Keep Alive Timer来表征 (2) 标准规定的Keep Alive Timer默认值是54小时 (3) Keep Alive Timer设置为0代表300秒 (4) 终端和网络侧分别监测前向信道和反向信道的Traffic,如果终端 或者网络侧在定时器Keep Alive Timer内没有发现数据活动,将发 送"KeepAliveRequest",接收方将回复"KeepAliveResponse"

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Connection
EV-DO 呼叫流程

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Connection的相关概念 (1) Connection与空中接口资源相关,分配前/反向链路业务信道 (2) 由MAC Index唯一标识 (3) Connection的建立由AT的"ConnectionRequest" 或者 AN的"Page Message"来触发 (4) 系统为每一个AT保持一个timer(计时器),当没有数据传输时 时,计数器开始计时;当任何时间有数据流时,该定时器清0. Dormancy Timer取值范围为0~60秒 (5) 当计时器期满后,AT或AN就会发"Connection Close",准备进入 连 接释放状态
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RP Session
EV-DO 呼叫流程

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RP Session的相关概念 (1) RP Session:PCF 和 PDSN之间 (2) A11:信令消息 (3) A10:业务数据 (4) 通过RRQ消息来建立 (5) RP Session的释放是通过设置RRQ消息中"life time"为0来实现 (6) 在QoS的情况下,主连接建立完成后将会建立辅连接来传输QoS流

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PPP

EV-DO 呼叫流程

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PPP的相关概念 (1) PPP:AT 和 PDSN之间 (2) 在RP Session建立完成之后通过LCP (Link Control Protocol)建立 (3) 通过PDSN侧的"Inactive Timer"来维护

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EV-DO 呼叫流程

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2. 呼叫处理体系结构

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呼叫处理体系结构
EV-DO 呼叫流程 1 13

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呼叫处理体系结构
EV-DO 呼叫流程 1 14

OHM负责: "Session Parameter","Connection Setup","Handoff"和 "Channel Selection" TP负责: "Traffic Processing","Configuration Negotiation","Power Control","RP Session Setup and Maintenance","RAN Authentication" "Connection Setup","Handoff"和"Connection Release"的所有信 令消息都在OHM和RLM之间进行交互 在呼叫激活状态下,TP把从AT过来的"RouteUpdate"消息转给OHM来 执行切换 OHM和A13共同管理Idle切换
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EV-DO 呼叫流程

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3. 系统广播消息

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目录
EV-DO 呼叫流程 1 16

Quick Config Message Sync Message Sector Parameters Access Parameters

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Quick Config Message
EV-DO 呼叫流程

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quick_config color_code = 21 (0x15) sector_id24 = 513 (0x201) sector_signature = 2 (0x2) access_signature = 1 (0x1) redirect = 0 (0x0) rpc_count_63_to_0 = 0 (0x0) infer_incl = 1 (0x1) rpc_count_127_to_64_incl = 1 (0x1) rpc_count_127_to_64 = 1 (0x1) fwd_traffic_valid_127_to_64[0] = 1 (0x1) (macIndex 127 valid) infer_incl2 = 1 (0x1) rpc_count_130_to_383_incl = 0 (0x0)

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Sync Message
EV-DO 呼叫流程

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sync maximum_revision = 1 (0x1) minimum_revision = 1 (0x1) pilot_pn = 160 (0xa0) system_time = 0x07e9a30ad6

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Sector Parameter Message
EV-DO 呼叫流程

message_id = 1 (0x1) (SectorParameters) sec_parms country_code = 0 (0x0) sector_id[0] = 128 (0x80) sector_id[1] = 0 (0x0) sector_id[2] = 0 (0x0) sector_id[3] = 64 (0x40) sector_id[4] = 172 (0xac) sector_id[5] = 4097 (0x1001) sector_id[6] = 9216 (0x2400) sector_id[7] = 513 (0x201) subnet_mask = 104 (0x68) sector_signature = 2 (0x2) latitude = 1296000 (0x13c680) longitude = 2592000 (0x278d00) route_update_radius_overhead = 0 (0x0) leap_seconds = 14 (0xe) local_time_offset = 480 (0x1e0) reverse_link_silence_duration = 1 (0x1) reverse_link_silence_period = 1 (0x1) channel_count = 1 (0x1) channel[0] system_type = 0 (0x0) band_class = 0 (0x0) channel_number = 160 (0xa0) nghbr_count = 2 (0x2) nghbr_pilot_pn[0] = 188 (0xbc) nghbr_pilot_pn[1] = 288 (0x120)
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Access Parameter Message
EV-DO 呼叫流程

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message_id = 1 (0x1) (AccessParameters) access_cycle_duration = 16 (0x10) access_signature = 1 (0x1) open_loop_adjust = 81 (0x51) probe_initial_adjust = 0 (0x0) probe_num_step = 5 (0x5) power_step = 8 (0x8) preamble_length = 2 (0x2) capsule_length_max = 4 (0x4) a_persistence[0] = 0 (0x0) a_persistence[1] = 0 (0x0) a_persistence[2] = 0 (0x0) a_persistence[3] = 0 (0x0) infer_incl = 1 (0x1) enhanced_params_incl = 1 (0x1) preamble_length_slots = 0 (0x0) (4 Slots) access_offset = 0 (0x0) (0 Slots) sector_access_max_rate = 2 (0x2) (38.4kbs) probe_timeout_adj = 0 (0x0) (0 slot) pilot_strength_Nominal = 0 (0x0) (0 dB) pilot_strength_Correct_min = 0 (0x0) (0 dB) pilot_strength_Correct_max = 5 (0x5) (5 dB) infer_incl2 = 1 (0x1) max_pn_random_delay_incl = 0 (0x0) infer_incl3 = 1 (0x1) emergencyAPersistence_incl = 0 (0x0) infer_incl4 = 0 (0x0)
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EV-DO 呼叫流程

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4. 基本呼叫流程

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目录
EV-DO 呼叫流程 1 22

Session Setup Connection Setup Active Soft Handoff Virtual Soft Handoff Color Code Idle Handoff Hybrid AT

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Session Setup
EV-DO 呼叫流程

AT
UATIRequest (RATI) RouteUpdate ACAck

RLM

FLM
AccessChannelPacketInd SendControlChannelPacketCMD

OHM

TP

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UATIAssignment UATIComplete/RU ACAck Connection Setup/RU

ControlChannelPacket

AccessChannelPacketInd (UATIComplete) AccessChannelPacketInd Allocate_Traffic_Channel_Req Allocate_Channel_Req/Rsp Allocate_Traffic_Channel_Rsp Traffic_Channels_Allocated Allocate_ATSession_Req Allocate_AT_Session_Rsp

Soft_Handoff_Count_Ind/Set_DRC_And_ACK_Info Traffic_Channel_Assignment ControlChannelPacket TCA RTC_ACK TCC TCC_Ind ConfigurationRequest ConfigurationResp ConfigurationComplete ConfigurationRequest ConfigurationResp ConfigurationComplete ConnectionClose ConnectionCloseReply Deallocate_Traffic_Channel_Cmd Deallocate_Traffic_Channel_Cmd Deallocate_All_Traffic_Channels Mibile_Acquired_Ind/ Forward_Desired_Ind Send_TCA

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Connection Setup
EV-DO 呼叫流程 AT
RLM

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FLM

OHM

TP

PCF

PDSN

Connection Setup/RU AccessChannelPacketInd Allocate_Traffic_Channel_Req Allocate_Channel_Req/Rsp Allocate_Traffic_Channel_Rsp

Allocate_ATSession_Req Allocate_AT_Session_Rsp

Traffic_Channels_Allocated

Soft_Handoff_Count_Ind/Set_DRC_And_ACK_Info Traffic_Channel_Assignment ControlChannelPacket TCA RTC_ACK TCC TCC_Ind XON or RLP Data Setup_A10_Req RRQ Setup Airlink Rec RRQ Reply Setup_A10_Rsp RRQ Start Airlink Rec RRQ Reply ConnectionClose ConnectionCloseReply Send_Stop_Airlink_Re Deallocate_All_Traffic_Channels cord Deallocate_Traffic_Channel_Cmd Deallocate_Traffic_Channel_Cmd Mibile_Acquired_Ind/ Forward_Desired_Ind Send_TCA

RRQ Stop Airlink Rec

RRQ Reply

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Active Soft Handoff
EV-DO 呼叫流程 AT

RLM1

FLM1

OHM

TP

RLM2

FLM2

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RouteUpdate Warp_Frame_Ind Route_Update_Ind Allocate_Traffic_Channel_Req Allocate_Traffic_Channel_Rsp Traffic_Channels_Allocated Soft_Handoff_Count_Ind/Set_DRC_Ack_Info Soft_Handoff_Count_Ind/Set_DRC_Ack_Info TCA TCC TCC_Ind Traffic_Channel_Assignment Allocate_Channel_Req/Rsp

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Virtual Soft Handoff
EV-DO 呼叫流程 AT
RLM1 FLM1 OHM TP RLM2 FLM2
DRC Send_Frame_Cmd RLP Data

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Stop DRC

Forward_Stop_Ind (Frame#)

DRC Forward_Desired_Ind

Send_Frame_Cmd

RLP Data

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Color Code Idle Handoff
EV-DO 呼叫流程 AT
Target Cell

Target OHM

Target PCF

Source OHM

Source PCF

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PDSN

UATIReq with UATI

ACAck

AccessChannelPacketInd

Ohm_SI_Req_To_A11 A13_Session_Information_Request

A11_SI_Req_To_Ohm Ohm_SI_Rsp_To_A11

A13_Session_Information_Response A11_SI_Rsp_To_Ohm UATIAssignment UATIAssignment

UATIComplete

ACAck

UATIComplete

Ohm_SI_Confirm_To_A11 Allocate_A10_Req Idle_Transfer_Req

A13_Session_Confirm A11_SI_Confirm_To_Ohm RRQ Setup Airlink Record/MEI RRQ Reply (Accept)

Allocate_A10_Rsp

Registration Update

RRQ LT=0 Session_close RRQ Reply (accept)

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Hybrid AT
EV-DO 呼叫流程

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AT is capable of 3G 1x and 1xEV-DO For Data, 1xEV-DO is the preferred technology AT ignores the 1xEV-DO while on 3G-1x AT will constantly monitor the 3G-1x Paging Channel while on 1xEVDO, tune away. This tune away happens at regular SCI interval, 1.28s, 2.56s, or 5.12s, etc. Hand up and Hand down supported by AT only

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EV-DO 呼叫流程

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Q&A

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