Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W72/00—Local resource management
  • H04W72/20—Control channels or signalling for resource management
  • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
  • H04W72/231—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal the control data signalling from the layers above the physical layer, e.g. RRC or MAC-CE signalling
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L1/00—Arrangements for detecting or preventing errors in the information received
  • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
  • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
  • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
  • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W72/00—Local resource management
  • H04W72/04—Wireless resource allocation
  • H04W72/044—Wireless resource allocation based on the type of the allocated resource
  • H04W72/0446—Resources in time domain, e.g. slots or frames
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W72/00—Local resource management
  • H04W72/20—Control channels or signalling for resource management
  • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W76/00—Connection management
  • H04W76/20—Manipulation of established connections
  • H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W74/00—Wireless channel access
  • H04W74/08—Non-scheduled access, e.g. ALOHA
  • H04W74/0833—Random access procedures, e.g. with 4-step access
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W74/00—Wireless channel access
  • H04W74/08—Non-scheduled access, e.g. ALOHA
  • H04W74/0833—Random access procedures, e.g. with 4-step access
  • H04W74/0838—Random access procedures, e.g. with 4-step access using contention-free random access [CFRA]

Definitions

• LTE Long Term Evolution
• Figure 1 shows an overview of an Evolved Universal Mobile
• E-UTRAN 100 Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN) 100 in accordance with the prior art.
• E-UTRAN 100 includes three eNodeBs (eNBs) 102, however, any number of eNBs may be included in E- UTRAN 100.
• the eNBs 102 are interconnected by an X2 interface 108.
• the eNBs 102 are also connected by an Sl interface 106 to the Evolved Packet Core (EPC) 104 that includes a Mobility Management Entity (MME) 112 and a Serving Gateway (S- GW) 110.
• EPC Evolved Packet Core
• MME Mobility Management Entity
• S- GW Serving Gateway
• the control plane protocol stack 300 includes the non-access stratum (NAS) 302 and a radio resource control (RRC) 304. Also included are the PDCP 306, RLC 308 and MAC 310, which together form the layer 2 sublayer 312. [0009]
• the MAC entity may be reset or reconfigured as required. A reconfiguration occurs when one or more of the MAC entity's parameters, such as random access channel (RACH) parameters, are modified.
• RACH random access channel
• a MAC reset procedure my be performed at handover, cell-reselection, radio resource control (RRC) connection re- establishment and upon the WTRU moving from RRC connected state to RRC idle state.
• the parameters for a MAC entity may be reconfigured by the upper layers.
• the WTRU may start using new RACH parameters the next time the random access procedure is initiated. This may include if an available set of physical random access channel (PRACH) resources for the transmission of the random access preamble and their corresponding radio access-radio network temporary identifiers (RA-RNTIs) are modified, for example. This may also include modifying groups of random access preambles and a set of available random access preambles in each group.
• PRACH physical random access channel
• RA-RNTIs radio access-radio network temporary identifiers
• a method and apparatus are disclosed for resetting and reconfiguring a medium access control (MAC) entity in a wireless transmit receive unit (WTRU).
• This may include a transmitter in a WTRU transmitting a MAC reset or reconfiguration request.
• a receiver in a WTRU may receive a MAC reset or reconfiguration command that includes new MAC parameter values.
• the WTRU may reconfigure the MAC entity based on the new MAC parameter values taken from the MAC reconfiguration command or reset all the MAC parameters.
• Figure 1 shows an overview of an Evolved Universal Mobile
• Figure 4 shows a method of resetting a MAC entity in accordance with the prior art
• Figure 5 shows a wireless communication system including a plurality of WTRUs and an e Node B (eNB); and
• Figure 6 is a functional block diagram of the WTRU and the eNB of the wireless communication system of Figure 5;
• Figure 14 shows a method for resetting DRX parameters in accordance with an embodiment
• Figure 5 shows a wireless communication system 500 including a plurality of WTRUs 510 and an e Node B (eNB) 520. As shown in Figure 5, the WTRUs 510 are in communication with the eNB 520. Although three WTRUs 510 and one eNB 520 are shown in Figure 5, it should be noted that any combination of wireless and wired devices may be included in the wireless communication system 500.
• eNB e Node B
• An RRC entity may reconfigure a MAC entity.
• the MAC entity may send a signal to the RRC entity to request, or trigger, the reconfiguration. Any one of the events listed below may cause the MAC to request that the RRC send a reconfiguration command to the MAC: a. a predetermined threshold number of random access channel (RACH) re-tries has been reached; b. the reserved dedicated RACH preambles expire; c. SPS transitions from the talk-spurt period to the silent period; d. SPS transitions from the silent period to talk-spurt period; e. the discontinuous reception (DRX) function loses synchronization between the WTRU and the eNB; f.
• RACH random access channel
• FIG. 8 shows a method of MAC reconfiguration 800 in accordance with an embodiment.
• the MAC entity in a WTRU receives an RRC signal or a MAC CE indicating that the MAC should reconfigure its parameters.
• the MAC entity reconfigures MAC state variables to their initial values, default values, or values that are included in the MAC CE or RRC signal.
• the MAC entity reconfigures MAC parameters to values that are included in the MAC CE or RRC signal.
• the WTRU starts, stops or restarts timers associated with the reconfigured functions of the MAC entity, such as the on- duration timer and inactivity timer associated with reconfiguring a DRX cycle, for example.
• the WTRU configures the parameters for the talk-spurt state.
• the deallocation for the old configuration and the configuration of the new parameter values may be performed in next immediate TTI. Alternatively the timing of the activation of the values for the reconfigured parameters may be based on an activation time conveyed in the reconfiguration message.
• the WTRU may continue the persistent transmission after the expiration of the current configuration. Alternatively, if parameters are reconfigured for an extension of current talk- spurt period, the new parameters should be used in the extended persistent transmission period.
• the WTRU discards HARQ PDUs from the HARQ transmit buffer in the transmitting side of the MAC entity and notifies the upper layers of the discarded corresponding MAC SDUs.
• the WTRU discards MAC SDUs from the SDU transmit buffer in the transmitting side of the MAC entity and notifies the upper layers of the discarded SDUs.
• An eNodeB configured to reconfigure a medium access control (MAC) entity of a wireless transmit receive unit (WTRU), the eNB comprising a receiver configured to receive a MAC reset request, a transmitter configured to transmit a MAC reset command, and a processor configured to determine a requirement for a MAC entity reset.
• eNB eNodeB
• MAC medium access control
• a processor in association with software may be used to implement a radio frequency transceiver for use in a wireless transmit receive unit (WTRU), user equipment (UE), terminal, base station, radio network controller (RNC), or any host computer.
• the WTRU may be used in conjunction with modules, implemented in hardware and/or software, such as a camera, a video camera module, a videophone, a speakerphone, a vibration device, a speaker, a microphone, a television transceiver, a hands free headset, a keyboard, a Bluetooth® module, a frequency modulated (FM) radio unit, a liquid crystal display (LCD) display unit, an organic light -emitting diode (OLED) display unit, a digital music player, a media player, a video game player module, an Internet browser, and/or any wireless local area network (WLAN) or Ultra Wide Band (UWB) module.
• WLAN wireless local area network
• UWB Ultra Wide Band

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• Engineering & Computer Science (AREA)
• Computer Networks & Wireless Communication (AREA)
• Signal Processing (AREA)
• Mobile Radio Communication Systems (AREA)

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