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AssigneeInterDigital Technology Corporation
InventorsChristopher Cave, Paul Marinier, Vincent Roy, Rocco DiGirolamo
Estimating the term…
A method and apparatus for assigning radio resources and controlling parameters for transmission over a random access channel in wireless communications by enhancing a random access channel is disclosed.
A method for transmitting data using enhanced random access channel (RACH) procedure, the method comprising:
A wireless transmit-receive unit (WTRU) comprising:
A method for establishing access to an uplink channel, the method comprising:
A wireless transmit-receive unit (WTRU) comprising:
A method for assigning radio resources and controlling transmission parameters over a random access channel in wireless communications, comprising the steps of:
Dependencies are inferred from the claim text.
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TPC algorithms: deriving transmission power values from another channel
Local resource management: wireless resource allocation
Based on the type of the allocated resource: resources in time domain, e.g. slots or frames
Using a dedicated channel for access: for synchronized access
About 3 years 5 months of term left · ends 16 Mar 2030 (estimated)
The present invention is related to wireless communications.
In 3GPP UMTS (Third Generation Partnership Project Universal Mobile Telecommunication System) wireless systems, the Random Access Channel (RACH) is an uplink (UL) transport channel that is used for transfer of data and/or control information in the absence of a dedicated radio link. The RACH is mapped to the physical random access channel (PRACH).
Access to the RACH by a wireless transmit-receive unit (WTRU) is based on a slotted-Aloha approach, with acquisition indication received from a radio access network (RAN). The WTRU must first acquire the channel by transmitting a preamble, which comprises a signature sequence that is randomly selected among a set of predetermined sequences. The transmit power of the initial preamble is determined by open loop power control, with parameters determined and broadcast by the RAN.
FIG. 1A shows an existing frame format for a physical random access channel (PRACH).
FIG. 1B shows a frame format for a physical random access channel (PRACH) according to the present disclosure.
FIG. 2 shows a frame structure for an existing acquisition indicator channel (AICH).
Hereafter, a wireless transmit/receive unit (WTRU) includes but is not limited to a user equipment, mobile station, fixed or mobile subscriber unit, pager, or any other type of device capable of operating in a wireless environment. When referred to hereafter, a base station includes but is not limited to a Node-B, site controller, access point or any other type of interfacing device in a wireless environment.
Although described within the scope of 3GPP UMTS and UMTS Terrestrial Radio Access (UTRA) wireless communication systems, the following embodiments and teachings are applicable to other wireless communications technologies, including those systems employing random access channels for uplink transmission.
FIG. 1B shows a proposed frame format for a physical random access channel (PRACH). FIG. 1B indicates several methods, not to be considered exhaustive, which may be used individually or in any combination to increase the transmission rate of PRACH frames. A first method includes decreasing a spreading factor (SF) used on the data part 17. A second method includes increasing the number of channelization codes used for the data part 17. A third method includes increasing the order of modulations (e.g. using 8-PSK, 16-QAM, 64-QAM) and variable coding rates (i.e. MSC) for the data part 17. Optionally, the control part of the PRACH frame 12 may be modified to support the higher data rates. An increase in the transmission power of the control part is proposed to improve the reliability of the pilot field when high data rates are used. Specifically, the power offset between the last preamble and the PRACH control part (Pp−m=Pmessage-control−Ppreamble) may be transmission rate dependant, rather than having a single value.