Abstract:
A received PDU (46, 56) is sequentially identified by an n-bit frame (129b) number (FN) and an m-bit hyper frame (129a) number (HFN), which are synchronously maintained on first (120) and second (130) stations. The second (130) station determines an activation time (129c) at which a ciphering key (128a,b) change is to occur, and composes a security mode command (110) that includes an identifying FN (117) corresponding to the activation time (116), and x least-significant (118) bits (LSBs) from the HFN (129a) of the identifying FN (129b), then tramsmits the command (110) to the first (120) station. The x LSBs (118) enable the first (120) station to resolve cyclical ambiguities of the identifying FN (129b) to properly construct an application time (139c). The first (120) station uses a first ciphering key (128a) to decrypt (128) PDUs (46, 56) with FNs (129b) sequentially prior to the application time (139c), and uses a second key (128) to decrypt (128) PDUs (46, 56) with FNs (129b) sequentially on or after the application time (139c).
Abstract:
Several methods to avoid potential deadlocks in a SDU discard function are disclosed. First, the decision rule of deciding discarded SDUs in a SDU discard function is modified. Consideration of the Length Indicator is added to the decision of discarded SDUs in a SDU discard function to completely cover the SDU set that should be discarded. Secondly, the status-formatted padding PDU is chosen when padding PDUs is needed. Finally, modified explicit SDU discarding SUFI to cover scenarios that cannot be handled by the conventional MRW SUFI is utilized.
Abstract:
Within a move receiving window (MRW) super-field (240) there is an initial sequence number (249) that is arranged within the MRW super-field (240) according to a set algorithm. The MRW super-field (240) is transmitted to a receiver, and the receiver extracts the initial sequence number (249). The receiver then assumes that all other layer 2 PDU sequence numbers within the MRW super-field (240) are sequentially after the initial sequence number (249) to effect discarding of layer 2 SDUs. The initial sequence number (249) is assumed to be either sequentially on or after a starting point sequence number (249), or sequentially before an end point sequence number of a receiving window of the receiver, depending on whether a special case value exists for the length field (243) of the MRW super-field (240). The special case value indicates that a single SDU that extends beyond a transmitting window of the transmitter is to be discarded.
Abstract:
A wireless communications protocol utilizes protocol data units (PDUs) (130) for transmitting and receiving service data units (SDUs) (134b, 134c). Each PDU (130) has a sequence number (131) of n bits for indicating a relative sequential ordering of the PDU (130) in a transmitted or received stream of PDUs (130). A transmission time interval (TTI) (113) is also used in which a predetermined number of PDUs (130) are transmitted or received. PDUs (130) are received within a TTI (113). A starting sequence number (131) and an ending sequence number (131) for received PDUs (130) within the TTI (113) are found. Any received PDU (130) within the TTI (113) that has a sequence number (131) or that is sequentially after the ending sequence number (131) is discarded.
Abstract:
A mobile unit, or UE (User Equipment) includes a Radio Resource Control (RRC) and a plurality of unique states defining the connectivity between the UE and a base station. Once a RRC indicates that it is "Out of Service", a series of timers are started to limit the duration of attempts by the RRC to re-enter an "In Service" condition before the RRC releases allocated resources and moves to an Idle Mode. In certain circumstances, it is necessary to stop one or more of these timers to prevent inadvertently severing the connection.
Abstract:
This invention provides an enhancement to the current mechanism use to make mobile device enter idle mode if a suitable cell could not be found and avoid unnecessary power consumption.
Abstract:
【課題】無線通信システム内におけるデバイスツーデバイス(D2D)通信のための方法を提供する。 【解決手段】D2D送信とセルラー送信をセルラーアップリンクタイムスロットに割り当てられたリソースブロックで同時に実行するかどうかを決定し、D2D送信レート(R D2D )に加えたセルラーアップリンク(UL)送信レート(R UL )が最大セルラーUL送信レート(R C )に等しいかそれより大きい場合に、D2D送信とセルラー送信を同時に実行するとともに、D2D送信レートに加えたセルラーUL送信レートである総合送信レートが最大になるようにD2D送信の電力(P D2D )及びセルラー送信の電力(P UL )を調整する。 【選択図】図5