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Mip generic slides
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- 2. 2 MSC Pool TrafficDistribution – BSC/RNC distributes subscribers roaming into the pool area among the MSCs. – Subscribers remain registered in the same MSC until they roam out of the pool area. Service Area 1 MSCMSC BSC/ RNC BSC/ RNC Service Area 2 MSCMSC Service Area 3 MSCMSC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC Pool Service Area MSCMSC BSC/ RNC BSC/ RNC MSCMSC MSCMSC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC Traffic distribution based on relative MSC capacity Reduced load, as less Handover and Location Update traffic. MSC MSC MSC No impacts on terminals.
- 3. 3 Relative Capacity Factor (1-255), definedin BSC Resulting Traffic in % MSC1 4 50% MSC2 2 25% MSC3 2 25% Relative Capacity Factor (1-255), defined in BSC Resulting Traffic in % NRI (0-1023), defined in MSC and BSC MSC1 4 50% 1, 2, 3, 4 MSC2 2 25% 5, 6 MSC3 2 25% 7, 8 MSC1MSC1 BSC/ RNC BSC/ RNC MSC2MSC2 MSC3MSC3 BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC Pool Service Area MSC Pool Traffic Distribution, Example of Location Updating with IMSI – BSC distributes subscribers roaming into the pool area among the MSCs. – Subscribers remain registered in the same MSC until they roam out of the pool area. BSC selects one MSC, according to the relative MSC capacity factors. BSC selects MSC1. Location Update (IMSI) Subscriber roams into the pool. MSC assigns a TMSI, including a NRI. The NRI identifies the MSC. Temporary Mobile Subscriber Identity (TMSI) TMSI Generation Network Resource Identifier (NRI) TMSI Identification TMSI Assignment (TMSI incl. NRI=1)
- 4. 4 MSC1MSC1 BSC/ RNC BSC/ RNC MSC2MSC2 MSC3MSC3 BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC Pool ServiceArea MSC Pool Traffic Distribution, Example of Call Setup – BSC routes the traffic towards the MSC identified by the NRI BSC routes the traffic to the MSC identified by the NRI. “Call Setup” (TMSI incl. NRI=1)Subscriber, registered in the pool, initiates now a call. MSC verifies NRI and handles call as normal. Temporary Mobile Subscriber Identity (TMSI) TMSI Generation Network Resource Identifier (NRI) TMSI Identification “Call Continue” Relative Capacity Factor (1-255), defined in BSC Resulting Traffic in % NRI (0-1023), defined in MSC and BSC MSC1 4 50% 1, 2, 3, 4 MSC2 2 25% 5, 6 MSC3 2 25% 7, 8
- 5. 5 MSC Pool LoadDistribution Service Area 1 MSCMSC BSC/ RNC BSC/ RNC Service Area 2 MSCMSC Service Area 3 MSCMSC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC Pool Service Area MSCMSC BSC/ RNC BSC/ RNC MSCMSC MSCMSC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC – The load is distributed over the MSCs in the pool. No load peaks in individual MSCs. – Pooling gives more capacity, as the existing capacity is utilized more efficiently. MSC MSC MSC MSC MSC MSCMSCMSC MSCMSC MSCMSC MSCMSC High Risk for Congestion No Risk for Congestion Simplified dimensioning and planning.
- 6. 6 MSC Pool ScaleableCapacity Pool Service Area MSCMSC BSC/ RNC BSC/ RNC MSCMSC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC – Number of pool members can be increased over time to match the traffic growth no complex BSC/RNC re-homing Service Area 1 MSCMSC BSC/ RNC BSC/ RNC Service Area 2 MSCMSC BSCBSC BSCBSCBSC/ RNC BSC/ RNC BSCBSC MSCMSC MSCMSC MSCMSC MSCMSC MSCMSCMSCMSC MSCMSC MSCMSC MSC Service Area 2a Service Area 2b MSCMSC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC MSCMSCMSCMSCMSC MSCMSC MSCMSCMSCMSC MSCMSCMSCMSC Capacity expansion by service area split (re-configuration of radio network). Simple capacity expansion by adding one MSC. Independent RAN and CN planning.
- 7. 7 MSC Pool Redundancy ServiceArea 1 MSCMSC BSCBSC Service Area 2 MSCMSC Service Area 3 MSCMSC BSCBSC BSCBSCBSCBSC BSCBSC – When one MSC becomes unavailable (planned or unplanned) , the BSC/RNC redistributes the mobiles when they access the network among the remaining MSCs. Pool Service Area MSCMSC BSC/ RNC BSC/ RNC MSCMSC MSCMSC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC BSC/ RNC MSCMSC MSCMSC MSC MSC – Redistribution time of all mobiles is the ~same as the periodic registration time. – Incoming calls can be received, when the mobile station has been redistributed. – Benefit: Increased MSC In-Service Performance. “Zero” Down Time on MSC layer. An MSC can be taken out for service in controlled and graceful way for planned maintenance or upgrade when using load re-distribution. “Zero” Down Time. Increased ISP.