摘要:
There is disclosed a method of allocating a channelisation code comprising, for each user, defining a path in the code tree based on a required range of spreading factors, selecting a node of the path in dependence on the currently required spreading factor; and reserving all nodes on the code tree in an upward and downward direction from the selected node, wherein the selected node for any user must not coincide with a node reserved by any other user.
摘要:
A practical and efficient persistency control for the Universal Mobile Telecommunications System, comprising determining a persistency value for making random transmissions for access to the system, the method comprising: 1. determining for a system cell, the maximum allowable user equipment transmission power PMAX; 2. assessing the number in a current time interval of ongoing packet transmissions NCURRENT based upon a fraction &agr; of user equipment measured current transmission power Ptotal; 3. assessing the power available in a next time interval based upon the maximum allowable transmission power and the current transmission power, and determining therefrom a number of allowable new packets NNEXT in the next time interval; and 4. determining a persistency value p for transmission to user equipment in said cell, being a function of the number of ongoing packet transmissions NCURRENT and the number of allowable new packets NNEXT.
摘要:
The present invention provides a method and an apparatus for responding to changes in measurement of a system load in a spread spectrum communication system. Using a load control algorithm, for example, the spread spectrum communication system may handle sudden changes or variations, such as spikes or steps in system load measurements for an uplink and/or a downlink between a mobile unit and an access network. The load control algorithm determines whether a sudden variation of a measured system load is generated by a source not under a power control or is caused by a variation of a spread spectrum communication system load. A load control measure may be selectively applied to adjust one or more parameters associated with the system load. That is, an increase of a first new measurement value may be limited to a given maximum increment for one sampling time period of a plurality of sampling time periods in response to a spike in the system load or a desired response to a sudden increase of the system load may be delayed by a given maximum number of measurement samples. By allowing a limited increase, the response of the spread spectrum communication system to sudden changes of a system load may be controlled such that some blocking may occur but dropping of calls may be avoided. In this manner, the load control algorithm may avoid unnecessary dropping of calls.
摘要:
A telecommunications network comprises a base station and a mobile station in use in call connection on at least one uplink channel for communicating user data. The base station is operative such that on receipt of a command to transfer to and/or add at least one other uplink channel for communicating user data, the at least one other uplink channel is allocated to the call connection after a predetermined period during which power level adjustment is undertaken to compensate for mobile station movement.
摘要:
A radio telecommunications network comprises a transmitter (2) and a receiver (4). The transmitter (2) is operative to send signals indicative of data, and the receiver (4) is operative to receive the signals (12) and decode the signals to determine the data. The receiver (4) comprises indicator means to send to the transmitter (2) an indication of whether data has been correctly determined, and the transmitter (2) is operative to retransmit at least some data not correctly determined. The receiver (4) further comprises a buffer (14) operative to store the determined data. The buffer (14) is operative to output the determined data at a predetermined rate.
摘要:
A method is provided of transmission of a data frame from a first station to a second station, in a code division multiple access (CDMA) telecommunications network. The network operates according to a hierarchical series of protocol processes including a physical layer process under the control of a radio link control (RLC) process. An indication of when a data frame is passed to the physical layer process for transmission to the second station is sent to the RLC process in the first station. Upon receipt of the indication the RLC process, a timer is started to time a predetermined period before again passing the data frame to the physical layer process for retransmission to the second station unless an acknowledgement of receipt from the second station is received.
摘要:
In the method provided, test transmissions between the mobile user terminal and base station antennas are made, and the received test transmissions processed to determine respective signal path quality for each of the base station antennas. Upon the determined signal path quality exceeding a first predetermined threshold, but being less than a second predetermined threshold higher than the first predetermined threshold, the mobile user terminal is connected to the corresponding base station antenna by control channels but not data channels so as to be time synchronised. Upon the determined signal path quality exceeding the second predetermined threshold, the mobile user terminal is connected to the corresponding base station antenna by both control channels and data channels so as to be call connected.
摘要:
A mobile for use in the UMTS is arranged, on activation to read the Broadcast Control Channel (BCCH) for all available preamble signatures; to store the signatures in its processor; to read the Acquisition Indication Channel (AICH) for acquisition indicators sent to other mobiles; to store usage of other mobiles against each signature; and to select when required a signature the recorded usage of which is unlikely to cause collisions.
摘要:
In a data packet, e.g. a PDU of the UMTS, a length indicator field of variable granularity is created, depending on the exact length of the payload to be transmitted. An additional field is provided, a single bit in length, to indicate the granularity of the length indicator field. This increases the resolution of the header, whilst keeping low an overhead of extra field bits. The method comprises: assessing the length of the data to determine the appropriate units, from a plurality of possible units, in which the length should be expressed; setting the granularity field to define the appropriate units in which the length of the data is to be indicated; and setting the length indicator field to indicate the data length.
摘要:
In the Universal Mobile Telecommunications System, a method of transport format combination selection is provided for directing data units for transmission from a buffer in the RLC layer to transport channels in the MAC layer. The method includes providing a set of information channels in the RLC layer for connection to the buffer and a set of transport channels in the MAC layer for transmission of the data units, selecting a subset of the information channels and a subset of the transport channels for interconnection, and selecting for each transport channel one or more information channels to be multiplexed on the transport channel. A mapping table and a transport block combination table are created as a result of prioritizing the selected transport channels according to a predetermined scheme in dependence on the characteristics of the information channels and then there from, determining the number of data units which may be transmitted in a timing interval.