Abstract:
A wireless communication apparatus having a plurality of antennas 11-1 to 11-M and for diversity-combining signals received by the antennas 11-1 to 11-M, includes a first combining unit (23, 24) for combining received power of the antennas 11-1 to 11-M based on a first algorithm; a second combining unit (21-1 to 21-M, 22, 23) for combining received power of the antennas 11-1 to 11-M based on a second algorithm, which is different from the first algorithm; a determination unit 15 for determining whether there is a delayed wave based on the received signals; and a control unit 16 for selecting either one of the first combining unit (23, 24) and the second combining unit (21-1 to 21-M, 22, 23) depending on a determination result by the determination unit 15 and controlling a selected combining unit to combine received power of the antennas 11-1 to 11-M. Thus, it is possible to reduce the influence of multipath fading and maintain a constantly stable reception condition even when the number of reception antennas is small.
Abstract:
A wireless communication apparatus having a plurality of antennas 11-1 to 11-M, and for diversity-combining signals received by the antennas 11-1 to 11-M and performing communication with switching a modulation scheme according to a radio condition, includes a first combining unit (23, 24) for combining received power of the antennas 11-1 to 11-M based on a first algorithm; a second combining unit (21-1 to 21-M, 22, 23) for combining received power of the antennas 11-1 to 11-M based on a second algorithm different from the first algorithm; and a control unit 15 for selecting either one of the first combining unit (23, 24) and the second combining unit (21-1 to 21-M, 22, 23) depending on the modulation scheme and controlling a selected combining unit to combine received power of the antennas 11-1 to 11-M. Thus, it is possible, in performing wireless communication with adaptive modulation scheme, to reduce the influence of multipath fading caused by arrival waves with delays and maintain a constantly stable reception condition at a different modulation scheme even when the number of reception antennas is small.
Abstract:
In a transmission apparatus of a Gigabit Ethernet signal, in order to improve line efficiency, time division multiplexing is used. Further, if it is possible to branch/insert plural multiplexed Gigabit Ethernet signals at arbitrary nodes, it is possible to construct a more flexible network. For this reason, importance of a time division multiplexing apparatus having a function of branching/inserting Gigabit Ethernet signals is growing. A Gigabit Ethernet signal is monitored at the previous and subsequent stages of a cross connect unit, IFGs are inserted to the signal and switching is waited. If a signal state at the cross connection unit is an IFG, transmission path switching is performed, thereby performing transmission path switching without instantaneous interruption.
Abstract:
There is suppressed deterioration of transmission quality resulting from FWM light generated in the optical fiber of an optical transmission apparatus that performs wavelength division multiplex transmission. To suppress deterioration of the transmission quality due to the FWM light, the sender apparatus adjusts the intensity of wavelength-division-multiplexed light output to the optical fiber, according to a level of FWM crosstalk observed by receiver apparatus.
Abstract:
A radio base station (eNB1) receives load information indicating the load level of different radio base station (eNB2) and adjusts a base station parameter, which is used for defining coverage, in accordance with a result of comparison between the load level of the radio base station (eNB1) and that of the different radio base station (eNB2). The radio base station (eNB1) corrects at least one of the load level of the radio base station (eNB1) and that of the different radio base station (eNB2), which are compared with each other, in accordance with a number of radio terminals connected to the radio base station (eNB1).
Abstract:
Upon receipt of an RLF Indication message indicating a failure in a handover where a radio base station eNB10-1 is the handover source from the other radio base station eNB, the radio base station eNB10-1 can recognize that its coverage is not adjusted appropriately by referring to the RLF Indication message. Moreover, the radio base station eNB10-1 can adjust coverage appropriately by expanding the radiation area of the antenna 101 whose radiation area is directed toward the other radio base station eNB being the handover target, among the antennas 101 included in the radio base station eNB10-1.
Abstract:
A radio base station (eNB10-1) transmits a Resource Status Update message including first load information indicating the load level thereof to a radio base station (eNB10-2) when the load level thereof is less than a first threshold, and omits the transmission of the Resource Status Update message including the first load information when the load level thereof is the first threshold or more.
Abstract:
A radio base station (100) is provided with a stream determination unit (141) for determining whether communication quality of a radio communication channel between the radio base station (100) and a receiving device is lower than a predetermined threshold, and an antenna selector (142) for selecting, from among transmitting antennas (131-134), transmitting antennas such that the distance between the transmitting antennas (131-134) becomes shorter than that before the communication quality is determined to be lower than the predetermined threshold when the communication quality is determined to be lower than the predetermined threshold.
Abstract:
A radio base station (eNB1) receives load information indicating the load level of different radio base station (eNB2) and adjusts a base station parameter, which is used for defining coverage, in accordance with a result of comparison between the load level of the radio base station (eNB1) and that of the different radio base station (eNB2). The radio base station (eNB1) corrects at least one of the load level of the radio base station (eNB1) and that of the different radio base station (eNB2), which are compared with each other, in accordance with a number of radio terminals connected to the radio base station (eNB1).
Abstract:
A radio base station (100) is provided with a stream determination unit (141) for determining whether communication quality of a radio communication channel between the radio base station (100) and a receiving device is lower than a predetermined threshold, and an antenna selector (142) for selecting, from among transmitting antennas (131-134), transmitting antennas such that the distance between the transmitting antennas (131-134) becomes shorter than that before the communication quality is determined to be lower than the predetermined threshold when the communication quality is determined to be lower than the predetermined threshold.