请求达人详细介绍以下俩字段的含义与区别
时间：03-18
整理：3721RD
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如题。
TCH_RADIO_FAIL:Number of TCH transaction ended due to a radio failure during a call or a handover.UPDATED: When a TCH transaction fails and the TCH is released due to radio failure！和TCH_FAIL_CALL_HO：Number of TCH transaction failures during a call or a handover。UPDATED: When a TCH transaction fails and the TCH is released due to transaction failure.当两者次数较高时，优化措施，3Q……
TCH_RADIO_FAIL:Number of TCH transaction ended due to a radio failure during a call or a handover.UPDATED: When a TCH transaction fails and the TCH is released due to radio failure！和TCH_FAIL_CALL_HO：Number of TCH transaction failures during a call or a handover。UPDATED: When a TCH transaction fails and the TCH is released due to transaction failure.当两者次数较高时，优化措施，3Q……
前面一个是因为无线于娜因导致的tch失败，后面一个是所有原因导致的。
前面的较高，查干扰，查硬件故障。
自己补充下：TCH_FAIL_CALL_HO,通话过程中TCH业务请求失败，是指呼叫建立时TCH指配不成功？通话中掉话？还是其它的呢？