摘要:
A method for operating a mobile equipment (ME 10) in a wireless network (12) includes receiving from a wireless network a parameter that is indicative of a signal quality experienced by the ME, such as by determining a speed of the ME; calculating in the ME an indication of link quality, the calculation employing a filtering operation having a filter length that is a function of the determined parameter, such as speed or derivative of the speed of the ME; and reporting the calculated indication of link quality to the wireless network. The wireless network derives an indication of ME speed and transmits the speed indication to the ME using a point-to-point message.
摘要:
A method for operating a mobile equipment (ME 10) in a wireless network (12) includes receiving from a wireless network a parameter that is indicative of a signal quality experienced by the ME, such as by determining a speed of the ME; calculating in the ME an indication of link quality, the calculation employing a filtering operation having a filter length that is a function of the determined parameter, such as speed or derivative of the speed of the ME; and reporting the calculated indication of link quality to the wireless network. The wireless network derives an indication of ME speed and transmits the speed indication to the ME using a point-to-point message.
摘要:
A method for operating a mobile equipment (ME 10) in a wireless network (12) includes determining a parameter that is indicative of a signal quality experienced by the ME, such as by determining a speed of the ME; calculating in the ME an indication of link quality, the calculation employing a filtering operation having a filter length that is a function of the determined parameter, such as speed or derivative of the speed of the ME; and reporting the calculated indication of link quality to the wireless network. The step of determining includes steps of (a) deriving an indication of ME speed in the wireless network; and (b) transmitting the speed indication to the ME using a point-to-point message.
摘要:
A method for operating a mobile equipment (ME 10) in a wireless network (12), the method having steps of (A) determining a parameter that is indicative of a signal quality experienced by the ME, such as by determining a speed of the ME; (B) calculating in the ME an indication of link quality, the calculation employing a filtering operation having a filter length that is a function of the determined parameter, such as speed or derivative of the speed of the ME; and (C) reporting the calculated indication of link quality to the wireless network. The step of determining includes steps of (a) deriving an indication of ME speed in the wireless network; and (b) transmitting the speed indication to the ME using a point-to-point message. In a preferred embodiment the step of transmitting places the ME speed indication in padding bits of the point-to-point message, such as one sent on a Packet Associated Control Channel (PACCH). In a most preferred embodiment the step of transmitting uses a plurality of bits placed into padding bits of a Packet System Identification 13 (PSI13) message sent on the Packet Associated Control Channel (PACCH). The plurality of bits (e.g., four bits) are used to encode a plurality of speed subranges (e.g., 16 subranges) of a predetermined ME speed range (e.g., 0 km/hr to 250 km/hr). The indication of ME speed is used to one of modify or replace a forgetting factor “a” that is calculated using a parameter received in a broadcast message from the wireless network. The forgetting factor influences the length a running average filter that operates on link quality measurement data, such as a mean Bit Error Probability (BEP) or a coefficient of variation of the BEP.
摘要:
A method is presented for changing data rates in a communication connection between a transmitting device and a receiving device, in which communication connection—the information to be transmitted is in the form of bits grouped to code words and—bits are diagonally interleaved from code words into symbols, a predetermined number of consecutive symbols consituting a burst. The method comprises constructing the symbol according to a predetermined set of rules, wherein said predetermined set of rules are chosen according to the length of the code words.
摘要:
A method is presented for demodulating and decoding a block of received digital information consisting of a number of subblocks. One of a predefined number of demodulation methods is selected for demodulating each subblock and each subblock is demodulated with the demodulation method selected for it. The subblocks constituting a block of digital information are combined between their demodulation and the decoding of the block of digital information. Soft decoding is used to decode the block of digital information, wherein each subblock is converted to a sequence of soft decoding values associated with certain probabilities of allowed state transitions in the decoding process. For each subblock it is determined, after its demodulation, whether the correct demodulation method was selected for it. A subblock for which it is found that the correct demodulation method was not selected is converted to a sequence of neutral soft decoding values indicating equal probabilities for all allowed state transitions in the decoding process.
摘要:
A solution for the transmission of data in a time division multiple access (TDMA) based communication system is provided. A plurality of time slots in a TDMA frame is allocated to a subscriber unit for the transmission of speech data. The extra capacity provided to the subscriber unit is used for increasing the error tolerance of the speech data by adding extra redundancy to the speech data.
摘要:
Signalling information is conveyed from a transmitting device (101) to a receiving device (102) in a cellular radio network where user data transmission takes place on a traffic channel in discrete transmission bursts (111-120; 211-220; 310-313) consisting of consecutive symbols. A piece of signalling information is formatted into symbols which are transmitted as a block of consecutive symbols (FACCH) in a certain transmission burst of a traffic channel. It is also indicated within said certain transmission burst that it contains symbols carrying signalling information.
摘要:
Signalling information is conveyed from a transmitting device (101) to a receiving device (102) in a cellular radio network where user data transmission takes place on a traffic channel in discrete transmission bursts (111–120; 211–220; 310–313) consisting of consecutive symbols. A piece of signalling information is formatted into symbols which are transmitted as a block of consecutive symbols (FACCH) in a certain transmission burst of a traffic channel. It is also indicated within said certain transmission burst that it contains symbols carrying signalling information.
摘要:
A data transmission method and system for circuit switched and other services that can be employed in TDMA-based systems, and that supports the use of one or several types of modulation (e.g., 8-PSK modulation), in addition to a “normal” modulation (e.g., GMSK modulation) on a radio interface. An additional modulation/channel coding (e.g., one based on 8-PSK) may be used in the downlink transmission, while the normal modulation/channel coding (e.g., one based on GMSK) may be used in the uplink transmissions, under a variety of different conditions. A first condition arises where the radio conditions allow the use of the additional modulation in both directions, but the mobile station transmitter does not support it. A second condition arises where the radio conditions allow the use of the additional modulation in both directions, and the mobile station supports it, but the user requests a downlink-biased or uplink-biased data transmission service. A third condition arises where the mobile station supports the use of the additional modulation in both directions, but the uplink (or downlink) radio conditions do not permit the use of the additional modulation (e.g., because of link budget limitations.) Also, a lower data rate may be desired on the uplink in order to reduce the power consumption of the mobile station, and/or in the downlink direction to avoid unnecessary interference. This is especially true in the case that one direction or the other has less data to transmit, and the high speed data transmission mode is not required (even if supported).