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Diffstat (limited to 'src/tbf.txt')
| -rw-r--r-- | src/tbf.txt | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/src/tbf.txt b/src/tbf.txt index 57254ea3..eab58ba5 100644 --- a/src/tbf.txt +++ b/src/tbf.txt @@ -94,11 +94,27 @@ Handling of LLC Frame of downlink TBF and LLC Queue of downlink TBF: If a new LLC PDU is attached to LLC Frame during WAIT RELEASE state, the state is changed to FLOW (downlink flow is assigned to MS). + Handling of LLC Frame on uplink TBF: Received uplink blocks are appended to LLC Frame of TBF. If the PDU is complete, it is forwarded to the upper layer. + +Control TS: + On uplink or downlink assignment, it is required to have one timeslot that + can be used to receive and transmit. This timeslot is used at uplink TBF + to acknowledge and to assign other TBF. This timeslot is used at downlink + TBF to poll acknowledgement and to assign other TBF. + + The first common TS (first_common_ts) is calculated when channels are + allocated. After creation of TBF or after assignment to different TS layout, + the first common TS is used for control TS. + + The first common TS (and so control TS) must not need to be allocated to + MS as uplink TBF. (E.g. in case of non-available USF for this slot) + + Polling: In order to poll uplink control block from MS, a special poll state and frame number is stored at TBF. The scheduler reads that value and will not @@ -109,6 +125,10 @@ Polling: - The received frame is bad (BFI). - The GSM indicates that the block should have been already received. + Because polling requires uplink response from MS, the polling must be + performed at control TS. + + Data structures of TBFs and PDCHs: There is a global structure for BTS. |