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求高人解答关于诺西切换原因的问题
诺西话统关于触发切换的原因里有这个counter： CAUSE_MSC_INVOC 具体什么意思 有谁知道。一般小区这项统计的数据都为0，但有的小区统计有好几百次，比PBGT原因触发的切换都多。
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问题答案
查了一些资料供参考：
004028 / CAUSE RESPONSE TO MSC INVOCATION
对于MSC激活的响应
Counter ID: 004028 Network element name: CAUSE RESPONSE TO MSC
INVOCATION
NetAct name: CAUSE_MSC_INVOC
Description: Number of HO attempts due to a response to an invocation from the MSC
(outgoing).
Updated: When a HO is started due to a response to an MSC invocation.
See figures:
- Successful internal inter-cell TCH to TCH handover
- Successful external TCH to TCH handover, source BSC
- Successful internal inter-cell SDCCH to SDCCH handover
- Successful external SDCCH to SDCCH handover, source BSC
此类切换是BSC响应MSC发起的切换要求所发生的切换：
Traffic Reason Handover (TRHO)话务原因的切换是基于以下3个内容：
1、radio frequency resource indications of idle channel interferences，BTS发给BSC的空闲信道干扰电平统计；
2、resource indications，BSC发给MSC的资源指示；
3、radio interface measurements，手机、BTS上报给BSC的测量报告；
Traffic Reason Handover 是MSC要求BSC在特定小区下选择一定数量的手机切换至其他小区的功能：
This procedure is used by the MSC for asking the BSC to determine a given number of
mobile stations (MS) for handover from one specified cell to other specified cells. The
possible handovers are controlled by the MSC. The reason for a handover can be, for
example, an excessive load in the cell.
The MSC uses this procedure to request handovers from the BSS to a given number of
MSS from one cell to other specified cells. The MSC controls the possible handovers
and the reason for a handover may be excessive load in a cell.
该过程由MSC发起：
MSC发给BSC：handover_candidate_enquiry
BSC响应MSC的消息：handover_required、handover_required、。。。、handover_required、handover_candidate_response
HANDOVER CANDIDATE ENQUIRY消息包括要求的切换数量、源小区、目标小区：
The procedure starts with the HANDOVER CANDIDATE ENQUIRY message in which the
MSC informs the BSC of the number of handovers wanted. The MSC also informs the
BSC of the cell from which the MSS are to be transferred (source cell) and the cells into
which the MSS are to be handed over (target cells). The maximum number of adjacent
cells in the HANDOVER CANDIDATE ENQUIRY message in the BSC is 32.
BSC发送HANDOVER REQUIRED ，所有的HANDOVER REQUIRED发完后，发送HANDOVER CANDIDATE RESPONSE 消息通知MSC有多少个HANDOVER REQUIRED消息：
The BSC sends one HANDOVER REQUIRED message per an MS candidate to the MSC
using an appropriate signalling connection control part (SCCP) connection. The
message includes a list of candidate cells and the reason for the handover (response to
MSC invocation). The reason for the handover makes the HANDOVER REQUIRED
message different from the normal HANDOVER REQUIRED message. The BSC that has
received the HANDOVER CANDIDATE ENQUIRY message acts as the source BSC in the
possible MSC controlled external handover(s).
When the BSC has sent all HANDOVER REQUIRED messages generated by the enquiry,
it sends the HANDOVER CANDIDATE RESPONSE message to the MSC as an answer to
the MSC's HANDOVER CANDIDATE ENQUIRY message. In the HANDOVER CANDIDATE
RESPONSE message the BSC informs the MSC of the number of HANDOVER REQUIRED
messages that have been sent.
CAUSE RESPONSE TO MSC INVOCATION切换是由MSC发起的切换，MSC发起该切换要求的原因是该小区负荷过高。
没有找到MSC为什么要发起此类切换要求，有高手知道请补充，你看看有此类切换原因统计的小区是否话务量比较高吧
004028 / CAUSE RESPONSE TO MSC INVOCATION
对于MSC激活的响应
Counter ID: 004028 Network element name: CAUSE RESPONSE TO MSC
INVOCATION
NetAct name: CAUSE_MSC_INVOC
Description: Number of HO attempts due to a response to an invocation from the MSC
(outgoing).
Updated: When a HO is started due to a response to an MSC invocation.
See figures:
- Successful internal inter-cell TCH to TCH handover
- Successful external TCH to TCH handover, source BSC
- Successful internal inter-cell SDCCH to SDCCH handover
- Successful external SDCCH to SDCCH handover, source BSC
此类切换是BSC响应MSC发起的切换要求所发生的切换：
Traffic Reason Handover (TRHO)话务原因的切换是基于以下3个内容：
1、radio frequency resource indications of idle channel interferences，BTS发给BSC的空闲信道干扰电平统计；
2、resource indications，BSC发给MSC的资源指示；
3、radio interface measurements，手机、BTS上报给BSC的测量报告；
Traffic Reason Handover 是MSC要求BSC在特定小区下选择一定数量的手机切换至其他小区的功能：
This procedure is used by the MSC for asking the BSC to determine a given number of
mobile stations (MS) for handover from one specified cell to other specified cells. The
possible handovers are controlled by the MSC. The reason for a handover can be, for
example, an excessive load in the cell.
The MSC uses this procedure to request handovers from the BSS to a given number of
MSS from one cell to other specified cells. The MSC controls the possible handovers
and the reason for a handover may be excessive load in a cell.
该过程由MSC发起：
MSC发给BSC：handover_candidate_enquiry
BSC响应MSC的消息：handover_required、handover_required、。。。、handover_required、handover_candidate_response
HANDOVER CANDIDATE ENQUIRY消息包括要求的切换数量、源小区、目标小区：
The procedure starts with the HANDOVER CANDIDATE ENQUIRY message in which the
MSC informs the BSC of the number of handovers wanted. The MSC also informs the
BSC of the cell from which the MSS are to be transferred (source cell) and the cells into
which the MSS are to be handed over (target cells). The maximum number of adjacent
cells in the HANDOVER CANDIDATE ENQUIRY message in the BSC is 32.
BSC发送HANDOVER REQUIRED ，所有的HANDOVER REQUIRED发完后，发送HANDOVER CANDIDATE RESPONSE 消息通知MSC有多少个HANDOVER REQUIRED消息：
The BSC sends one HANDOVER REQUIRED message per an MS candidate to the MSC
using an appropriate signalling connection control part (SCCP) connection. The
message includes a list of candidate cells and the reason for the handover (response to
MSC invocation). The reason for the handover makes the HANDOVER REQUIRED
message different from the normal HANDOVER REQUIRED message. The BSC that has
received the HANDOVER CANDIDATE ENQUIRY message acts as the source BSC in the
possible MSC controlled external handover(s).
When the BSC has sent all HANDOVER REQUIRED messages generated by the enquiry,
it sends the HANDOVER CANDIDATE RESPONSE message to the MSC as an answer to
the MSC's HANDOVER CANDIDATE ENQUIRY message. In the HANDOVER CANDIDATE
RESPONSE message the BSC informs the MSC of the number of HANDOVER REQUIRED
messages that have been sent.
CAUSE RESPONSE TO MSC INVOCATION切换是由MSC发起的切换，MSC发起该切换要求的原因是该小区负荷过高。
没有找到MSC为什么要发起此类切换要求，有高手知道请补充，你看看有此类切换原因统计的小区是否话务量比较高吧
回答者：telnet8888 回答时间：2011-10-21 14:48
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