[ 使用工具条红框内的按钮，设置封面及页眉页脚的文档说明信息 SRAN8.0 LTE Multi-mode Feature Description Issue 01 Date 2013-02-18 HUAWEI TECHNOLOGIES CO., LTD. Copyright © Huawei Technologies Co., Ltd. 2013. All rights reserved. No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd. Trademarks and Permissions and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd. All other trademarks and trade names mentioned in this document are the property of their respective holders. Notice 1. The purchased products, services and features are stipulated by the commercial contract made between Huawei and the customer. All or partial products, services and features described in this document may not be within the purchased scope or the usage scope. Unless otherwise agreed by the contract, all statements, information, and recommendations in this document are provided "AS IS" without warranties, guarantees or representations of any kind, either express or implied. 2. The information in this document is subject to change without notice. Every effort has been made in the preparation of this document to ensure accuracy of the contents, but all statements, information, and recommendations in this document do not constitute the warranty of any kind, express or implied. 3. Except for the special declaration, LTE in this document is regarded as LTE FDD. 4. Except for the special declaration, MRRU in this document is regarded as RRU3908 V1/V2, RRU3928, RRU3929, RRU3926, RRU3942 or RRU3960. 5. Except for the special declaration, MRFU in this document is regarded as MFRU V1/V2, MRFUd or MRFUe. Huawei Technologies Co., Ltd. Address: Huawei Industrial Base Bantian, Longgang Shenzhen 518129 P.R.C. Website: http://www.huawei.com Email:
[email protected] Contents 46 Multi-mode Evolution 46.1 LTE Multi-mode basic features 46.1.1 MRFD-230002 Multi-mode BS RRU/RFU star-connection with separate CPRI Interface(eNodeB) 66.2 SingleSite 66.2.1 MRFD-231501 IP-Based Multi-mode Co-Transmission on BS side(eNodeB) 126.2.2 MRFD-231505 Bandwidth sharing of MBTS Multi-mode Co-Transmission(eNodeB) 146.2.3 MRFD-231601 Multi-mode BS Common Reference Clock(eNodeB) 206.2.4 MRFD-231602 Multi-mode BS Common IPSec (LTE) 216.3 Easy Refarming 216.3.1 MRFD-231806 GSM and LTE Dynamic Power Sharing(LTE) 236.3.2 MRFD-231808 GSM and LTE Buffer Zone Optimization(LTE) 256.4 Power Consumption Saving 256.4.1 MRFD-231901 Multi-RAT Carrier Joint Shutdown (eNodeB) 287 Acronyms and Abbreviations 1 Multi-mode Evolution 1.1 LTE Multi-mode basic features 1.1.1 MRFD-230002 Multi-mode BS RRU/RFU star-connection with separate CPRI Interface(eNodeB) Availability This feature is available from SRAN2.0, from SRAN5.0 GSM and LTE is supported. 1. IP-Based Dual-Mode Co-Transmission between GBTS and eNodeB Summary Huawei introduced the IP-based Dual-Mode Co-Transmission between BTS and eNodeB function in SRAN5.0. This function dynamically multiplexes BTS and eNodeB data onto one transmission link, saving transmission equipment and simplifying the transport network. Benefits This function provides the following benefits: · Reduced investment in transmission equipment · Fewer transmission resources required for the communication between the base station and routers · Simplified transport network · Convenient network maintenance Description Huawei radio equipment supports the GSM/LTE co-transmission in IP mode on the MBTS side. The dynamic multiplexing of the GSM and LTE data on the MBTS side saves the transmission resources of the last mile between the MBTS and the router and simplies the wireless transmission network. This feature is applicable to MBTS or GBTS、eNodeB co-sited scenarios. The GSM and LTE data can be dynamically multiplexed onto the IP transport network. Based on different destination IP addresses, the GSM and LTE services can be routed to the corresponding BSC or MME/S-GW. The following figure shows the co-transmission principles. The GSM data and LTE data packed in the IP packets share the transmission resources on the S1 interface. LMPT can provide the multiplex interface for GSM and LTE . The multiplex interface could GE electrical or GE optical. When the co-transmission is implemented on the S1 interface, the GSM data is switched to the LTE transmission board through the FE port on the GSM transmission board. The LTE transmission board multiplex the GSM data and LTE data and then transmits it on the shared GE transmission bandwidth on the transmission link. The following figure shows the co-transmission principles. This scheme implements the co-transmission in IP mode between the MBTS and the router. Enhancement Since SRAN7.0, dual-mode co-transmission based on UMPT is supported, GSM data is converged to UMPT(UMTS) or LMPT board, and then GL co-transmission, please see the below figure, From SRAN7.0, IP-based co-transmission through backplane interconnection is recommended. Dependency Impacts on the MBSC hardware None Impacts on the MBTS hardware GSM and LTE base station should share the BBU to support this feature In SRAN7.0, UMPT or LMPT board is required. Dependency on other features of the GBSS/RAN GBFD-118601 Abis over IP Dependency on other NEs None Dependency on other Modes This feature has to be activated with MRFD-211501 IP-Based Multi-mode Co-Transmission on BS side(GBTS) simultaneously 3. IP-based Triple-Mode Co-Transmission Among BTS, NodeB, and eNodeB Summary Huawei introduced the IP-based Triple-Mode Co-Transmission Among BTS, NodeB, and eNodeB function in SRAN7.0. This function dynamically multiplexes BTS, NodeB, and eNodeB data onto one transmission link, saving transmission equipment and simplifying the transport network. Benefits This function provides the following benefits: · Reduced investment in transmission equipment · Fewer transmission resources required for the communication between the base station and routers · Simplified transport network · Convenient network maintenance Description This function applies to MBTSs. This function dynamically multiplexes BTS, NodeB, and eNodeB data onto one transmission link. With different destination IP addresses, BTS, NodeB, and eNodeB data can reach the BSC, RNC, and MME/S-GW, respectively. The following figure shows the working principle of this function. The UMPT or UTRPc provides a port for multiplexing BTS, NodeB, and eNodeB data. The port can be an FE electrical port, FE optical port, GE electrical port, or GE optical port. The following figure shows the implementation of triple-mode co-transmission on the Abis/Iub/S1 interface. The GTMU sends BTS data to the UCIU through the BBU backplane. The WMPT sends NodeB data to the UCIU, also through the BBU backplane. The UCIU then sends the data to the UMPT (L), which multiplexes the data of the three modes onto one transmission link. In the preceding figure, a UTRPc can be installed in BBU 1. If a UTRPc is installed in BBU 1, the UCIU sends BTS and NodeB data to the UTRPc, and the UMPT (L) sends eNodeB data to the UTRPc. Upon receiving all the data, the UTRPc multiplexes the data onto one transmission link. Enhancement None. Dependency Dependency on BSC/RNC/MBSC hardware None Dependency on BTS/NodeB/eNodeB/MBTS hardware The UMPT or UTRPc must be configured Dependency on other features · GBFD-118601 Abis over IP · WRFD-050402 IP Transmission Introduction on Iub Interface Dependency on other NEs None Dependency on other modes This feature must be used together with the feature MRFD-231501 IP-Based Multi-mode Co-Transmission on BS side (eNodeB) and MRFD-211501 IP-Based Multi-mode Co-Transmission on BS side (GBTS). 1.2.2 MRFD-231505 Bandwidth sharing of MBTS Multi-mode Co-Transmission(eNodeB) Availability This feature is available from SRAN5.0. 1. GBTS and eNodeB Common Reference Clock Summary Huawei Multi-mode Base Station provides common reference clock of GSM and LTE when GSM and LTE co-BBU box from SRAN5.0. It can save the CAPEX and OPEX when GSM and LTE is deployed. Benefits It is a cost-effective solution to provide common reference clock when the BTS works in GSM and LTE co-BBU solution. Description Huawei Multi-mode Base Station provides common reference clock of GSM and LTE when GSM and LTE co-BBU box. Following cases is supported: · Common GPS reference clock For common GPS reference clock, only one set of external equipment is needed for GSM and LTE dual mode. And one set of external equipment is saved. Also one set of feeder and antenna is needed, the installation cost and deployment cost is saved accordingly. · Common BITS reference clock For common BITS reference clock, only one set of external equipment is needed for GSM and LTE dual mode. And one set of external equipment is saved and the cost is saved accordingly. · Common E1/T1 reference clock from Abis interface When GSM Abis interface is based on TDM of E1/T1, and LTE S1 interface is based on IP of FE/GE, LMPT can get the reference clock from the clock synchronized from the Abis E1/T1 in GTMU. Clock server is not necessary to be configured for LTE and the cost is saved accordingly. · Common E1/T1 reference clock from S1 interface When GSM and LTE BTS sharing the same transmission interface based on IP over E1/T1 or hybrid transmission based on IP, GTMU can get the reference clock from the clock synchronized from the S1 E1/T1 in UTRP for LTE mode. Clock server is not necessary to be configured and the cost is saved accordingly. Clock server is not necessary to be configured for GSM and the cost is saved accordingly. · Common Ethernet reference clock from S1 interface When common Ethernet reference clock is used，GSM can get the clock via BBU backplane from LMPT or UTRP. · Common IP network 1588V2 reference clock from S1 interface When GSM and LTE BTS supporting 1588V2 reference clock, only one 1588V2 clock server and client is required, GSM can get the clock via BBU backplane from LMPT. Enhancement None Dependency Impacts on the MBSC hardware None Impacts on the MBTS hardware Common BBU or BBUs inter-connected is required. · Common GPS/BITS reference clock BBU have to be configured with USCU（Universal satellite Card and Clock Unit） board · Common IP network 1588V2 reference clock from S1 interface IP Clock Server have to be configured. Dependency on other features of the GBSS/RAN · Common GPS reference clock MRFD-210501 BTS/NodeB Clock GBFD-510401 BTS GPS Synchronization LBFD-00300503 Synchronization with GPS · Common BITS reference clock MRFD-210501 BTS/NodeB Clock LBFD-00300504 Synchronization with BITS · Common Ethernet reference clock from S1 interface GBFD-118202 Synchronous Ethernet LOFD-00301301 Synchronization with Ethernet(ITU-T G.8261) · Common IP network 1588V2 reference clock from S1 interface GBFD-118620 Clock over IP Support 1588V2 LOFD-00301302 IEEE1588 V2 Clock Synchroniztion Dependency on other NEs None Dependency on other Modes This feature has to be activated with MRFD-211601 Multi-mode BS Common Reference Clock (GBTS) simultaneously 3. GBTS, NodeB and eNodeB Common Reference Clock Summary Huawei Multi-mode Base Station provides common reference clock of GSM, UMTS and LTE when GSM, UMTS and LTE under BBU inter-connected situation from SRAN7.0. It can save the CAPEX and OPEX when GSM, UMTS and LTE is deployed in one site. Benefits It is a cost-effective solution to provide common reference clock when the BTS works in GSM, UMTS and LTE BBU inter-connected solution. Description Huawei Multi-mode Base Station provides common reference clock of GSM, UMTS and LTE when GSM, UMTS and LTE BBU inter-connected. Following cases is supported: · Common GPS reference clock For common GPS reference clock, only one set of external equipment is needed for GSM, UMTS and LTE. One set of external equipment, one set of feeder and antenna are needed, the installation cost and deployment cost is saved accordingly. · Common BITS reference clock For common BITS reference clock, only one set of external equipment is needed for GSM, UMTS and LTE. The cost is saved accordingly. · Common E1/T1 reference clock from Abis/Iub interface When Abis/Iub interface is based on E1/T1, and LTE S1 interface is based on IP of GE, GSM/UMTS/LTE can get the reference clock from the clock synchronized from the Abis/Iub E1/T1. · Common Ethernet reference clock from S1 interface When common Ethernet reference clock is used，GSM and UMTS can get the clock via BBU backplane from LTE UMPT. · Common IP network 1588V2 reference clock from S1 interface When GSM, UMTS and LTE BTS supporting 1588V2 reference clock, only one 1588V2 clock server and client is required, GSM and UMTS can get the clock via BBU backplane from LTE UMPT. Enhancement None Dependency Impacts on the MBSC hardware NA Impacts on the MBTS hardware BBUs of GSM, UMTS and LTE base station shall be inter-connected. · Common GPS/BITS reference clock A BBU have to be configured with USCU（Universal satellite Card and Clock Unit）board · Common IP network 1588V2 reference clock from S1 interface IP Clock Server has to be configured. Dependency on other features of the GBSS/RAN · Common GPS reference clock MRFD-210501 BTS/NodeB Clock GBFD-510401 BTS GPS Synchronization LBFD-00300503 Synchronization with GPS · Common BITS reference clock MRFD-210501 BTS/NodeB Clock LBFD-00300504 Synchronization with BITS · Common Ethernet reference clock from S1 interface GBFD-118202 Synchronous Ethernet WRFD-050502 Synchronous Ethernet LOFD-00301301 Synchronization with Ethernet(ITU-T G.8261) · Common IP network 1588V2 reference clock from S1 interface GBFD-118620 Clock over IP Support 1588V2 WRFD-050501 Clock Sync on Ethernet in Node B LOFD-00301302 IEEE1588 V2 Clock Synchroniztion Dependency on other NEs NA Dependency on other Modes This feature has to be activated with MRFD-211601 Multi-mode BS Common Reference Clock (GBTS) and MRFD-221601 Multi-mode BS Common Reference Clock (NodeB) simultaneously 1.2.4 MRFD-231602 Multi-mode BS Common IPSec (LTE) Availability This feature is available from SRAN7.0. Summary Internet Protocol Security (IPSec) tunnels are shared among GSM, UMTS, and LTE modes by using an UMPT board. This ensures security of data transmission. Benefits · License fee is calculated based on the number of established IPSec tunnels. Therefore, sharing IPSec tunnels helps reduce the operator's security cost. · Sharing IPSec tunnels cuts the number of IP addresses required, reducing the complexity of deploying security networks. Description IPSec ensures confidentiality, integrity, and usability of transmission. It provides a security mechanism for base stations in all-IP transmission. IPSec provides security services for the IP layer, and therefore the upper layers, including TCP, UDP, ICMP, and SCTP, can use the security services. IPSec is a protocol suite for securing IP communications. It provides high-quality, interoperable, and cryptography-based security for IP packet transmission. Communication parties ensure the following security characteristics of data transmission on the network by encrypting and authenticating IP packets: · Confidentiality: User data is encrypted and transmitted in cipher text. · Integrity: The received data is verified to check whether data has been tampered with. · Authentication: Data is verified to confirm the sender of the data. · Anti-replay: The main goal of anti-replay is to prevent malicious attackers from repeatedly sending captured packets. The receiver will reject duplicate packets. Internet Protocol Security (IPSec) tunnels are shared among GSM, UMTS, and LTE modes by using an UMPT board. This ensures security of data transmission. Enhancement None Dependency Dependency on MBSC hardware None Dependency on MBTS hardware UMPT or UTRPc Dependency on other features MRFD-221501 IP-Based Multi-mode Co-Transmission on BS side (NodeB) One mode of multi-mode shall support IPSec feature (GBFD-113524 BTS Integrated IPsec，WRFD-140209 NodeB Integrated IPSec，LOFD-003009 IPsec) Dependency on other NEs None Dependency on other modes This feature must be used together with one of features MRFD-211602 Multi-mode BS Common IPSec (GSM) and MRFD-231602 Multi-mode BS Common IPSec (LTE), or both. 1.3 Easy Refarming 1.3.1 MRFD-231806 GSM and LTE Dynamic Power Sharing(LTE) Availability This feature is available from SRAN8.0. Summary GSM and LTE carriers in an MBTS can share one power amplifier (PA). If the busy hours of GSM and LTE carriers sharing one PA fall in different periods of a day or if traffic is not evenly distributed between the GSM and LTE carriers, this feature allocates the unused power of GSM carriers to LTE carriers during GSM off-peak hours to improve the service performance of LTE CEUs. When GSM peak hours arrive or there is GSM burst traffic, GSM reclaims the power to ensure its service quality. Benefits If each PA provides 5W shareable power and the LTE bandwidth is 20 MHz, simulation results are as follows: · In rural areas using the 850 MHz frequency band, this feature increases the throughput for about 30% of LTE users and increases the throughput of CEUs by about 12%. · In urban areas using the 1800 MHz frequency band, this feature increases the throughput for about 45% of LTE users and increases the throughput of CEUs by about 15%. However, this feature decreases the average throughput of LTE cells by less than 2%. Description According to field test results and simulation results, LTE CEUs experience low throughput. Therefore, improving the performance of LTE CEUs is significant. During GSM off-peak hours, the unused power of GSM carriers is allocated to LTE carriers, and LTE carriers allocate the power to CEUs. This feature improves the performance of these UEs by increasing the throughput of these UEs. However, it also decreases the average throughput of LTE cells. The pilot power of LTE cells remains the same. When GSM busy hours arrive or there is GSM burst traffic, the shared power is reclaimed to ensure GSM service performance. Figure 1-1 GSM and LTE power sharing This feature applies to scenarios where GSM and LTE carriers share one PA. This feature requires the following configurations: · LTE carriers must be configured with two transmit channels and two receive channels. · Each GSM cell must be configured with at least three carriers, and each PA must be configured with at least one non-BCCH GSM carrier. Enhancement None Dependency Dependency on MBSC hardware None Dependency on MBTS hardware All GL dual-mode RF units with two transmissions, or Two combined GL dual-mode RF units with one transmission Dependency on other features None Dependency on other NEs None Dependency on other Modes This feature has to be activated with MRFD-211806 GSM and LTE Dynamic Power Sharing (GSM) simultaneously 1.3.2 MRFD-231808 GSM and LTE Buffer Zone Optimization(LTE) Availability This feature is available from SRAN8.0. Summary If this feature is enabled in an LTE cell, the spectrum used by this cell can partially overlap with the spectrum used by neighboring GSM cells, and some UEs in the LTE cell can occupy the overlapping spectrum. This improves the spectrum usage and cell throughput. You can determine whether to enable this feature in an LTE cell according to the highest received signal strength indicator (RSSI) of neighboring GSM cells' broadcast control channels (BCCHs) and the reference signal received power (RSRP) measured by LTE cell edge users (CEUs). Benefits This feature allocates additional frequency resources to LTE cells in the GSM/LTE buffer zone, increasing the throughput of those LTE cells and improving the spectrum usage. Simulation results show that this feature increases the uplink throughput by 20% and downlink throughput by 16% for LTE cells if: · All base stations are evenly distributed with a distance of 300 m between each other. · The transmit power of GSM cells and LTE cells are 40 W and 2x20 W, respectively. · LTE carriers use the 20 MHz bandwidth, and GSM signals cause interference to 16 LTE resource block (RBs). Description In this era of mobile broadband, some operators directly evolve their GSM networks to LTE networks. At the initial stage of evolution from GSM to LTE, GSM network load is still high, but GL refarming allocates part of the GSM spectrum resources to LTE. As a result, the remaining GSM spectrum becomes insufficient to carry the heavy traffic of GSM services. A conflict for spectrum resources occurs between GSM and LTE carriers. To solve this problem, a buffer zone is established around each hot spot area. Traditionally, the GSM frequencies in a buffer zone will not be used by LTE or any other mode. This wastes spectrum resources. To address this issue, Huawei introduces the GL Buffer Zone Optimization feature based on operators' requirements and the characteristics of GSM and LTE. According to the dynamic measurement results from UEs in an LTE cell in the GL buffer zone, you can determine whether these LTE UEs are affected by GSM interference and whether to enable this feature in this LTE cell. If this feature is enabled in an LTE cell, the spectrum of this cell can overlap with the spectrum of neighboring GSM cells. This increases the bandwidth and throughput of the LTE cell. For example, assume that an operator has a 20 MHz spectrum, on which GL refarming is applied. In hot spot areas, 3.6 MHz out of the 20 MHz spectrum must be exclusively allocated to GSM. In addition, a buffer zone is established around each hot spot area to avoid interference between GSM and LTE. Traditionally, LTE cells in the buffer zone can use only a 15 MHz spectrum and the remaining 5 MHz spectrum can be used only by GSM, wasting spectrum resources. This feature enables some LTE cells in the buffer zone to use the entire 20 MHz spectrum, increasing the throughput of the LTE cells. Figure 1-2 Traditional spectrum reallocation Figure 1-3 Comparison between traditional and enhanced spectrum reallocation This feature applies to densely populated urban areas. During feature deployment, some spectrum resources must be reserved for GSM. You must purchase professional services from Huawei so that Huawei can help you determine which LTE cells in a GL buffer zone can use overlapping spectrum resources with GSM cells in the hot spot areas. Enhancement None Dependency Dependency on MBSC hardware None Dependency on MBTS hardware None Dependency on other features LOFD-001093 PUCCH Flexible Configuration Dependency on other NEs None Dependency on other modes This feature has to be activated with MRFD-211808 GSM and LTE Buffer Zone Optimization (GSM) simultaneously 1.4 Power Consumption Saving 1.4.1 MRFD-231901 Multi-RAT Carrier Joint Shutdown (eNodeB) Availability This feature is available from SRAN8.0.