Broadband wireless access method, broadband wireless access system and central control system
A central control system, broadband wireless technology, applied in the field of mobile communication, can solve problems such as high construction cost and energy waste, and achieve the effect of reducing network deployment cost and improving user experience
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Embodiment 1
[0047] This embodiment provides an improved LTE network architecture based on RoF technology, which can provide wireless access for high-speed moving objects (for example, high-speed trains), and also provides a cell handover mechanism under this architecture, so as to Improve system throughput and reduce handover call drop rate.
[0048] Figure 4 It is a schematic diagram of a broadband wireless access network architecture of a RoF-based high-speed railway according to Embodiment 1 of the present invention, as shown in Figure 4 As shown, the relay node (Relay Node, RN for short) in the existing LTE system architecture is placed on the high-speed train, and the wireless transmission between the ground and the train is realized by using the eNodeB to Relay Node (eNB-RN) air interface. Among them, the RN has two functions: one is that the RN acts as a relay between the eNB and the user, and establishes a wireless link between the LTE user in the carriage and the eNB beside th...
Embodiment 2
[0054] Since the trajectory of the high-speed trains running on the high-speed railway is usually fixed, its running time and direction are also predictable, and the distance between the trains is large, so this embodiment provides an improved LTE network architecture based on the RoF technology. A method for accessing a communication network of a wireless AP in a high-speed train.
[0055] Such as Figure 4 As shown, in the process of the embodiment, the relay node (Relay Node, RN for short) in the LTE system architecture can be placed on the high-speed train, and the wireless transmission between the ground and the train can be realized by using the eNB-RN air interface. For example, the RN can establish a wireless link between the LTE users in the car (that is, wireless APs in multiple modes) and the eNB beside the track through various communication modes supported in the car. On the basis of this access method, the LTE cell next to the track uses a CCS to connect and con...
Embodiment 3
[0060] In actual situations, the speed of high-speed trains is changing at any time, and it is impossible to accurately judge the time when the train enters the next RRU. Therefore, the simultaneous operation mode of two cells can be adopted, that is, RRU1 and RRU2 are turned on at the same time, and jointly form an RRU that moves together with the train. light chasing area. CCS can confirm the location and direction of the train by periodically sending beacon signals and receiving ACK signals from on-board RNs forwarded by different RRUs. That is, as the train moves, the CCS can only turn on the RRU closest to the train through the optical switch, and put the other RRUs in a sleep state, so that all the available spectrum resources of the cell can move with the train movement, without spectrum The waste of resources also reduces the consumption of electric energy and realizes green communication.
[0061] Such as Figure 5 As shown, the train runs from RRU1 to RRU2, RRU1 is...
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