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10月22日 暴力梦昨晚莫名其妙地就做了一个暴力的梦，睡得其实很踏实，小宝也没有哭闹，被子也盖得严严实实的.....但这个暴力的梦还来得特别真实、特别有分量。
--台海战争爆发了--
梦中就被吵醒了，窗外充满了轰隆隆的声音，老婆在床上踢我说，“去看看怎么了？”我拉开窗帘，半明半暗的天空竟然充满了各种战斗飞机，他们被分成两批对开着，一半向北飞去、另一半向南前进；大批的战斗机轰炸机就这样交错飞行着，彼此也没有开火，我想，战争开始了。向南的飞机一批又一批源源不绝，而向北的飞机似乎渐渐少了。我开始莫名其妙的担心起来，心里一点底没有，不知道平时国家养着的这帮杀人机器是否经过足够的训练？他们是否心里也上下没底？对手可是台湾空军--每年大批训练经费、大量的和米国的实战演习；不过似乎又不怎么担心，因为眼看着向北的飞机几乎寥寥了，而向南的飞机还是大批大批地飞过，低沉的发动机震得窗玻璃都在发抖......
随后的记忆好像就是在读报纸了，报道说几乎没有什么台湾的飞机飞到真正的目的地北京，而我们的战机却把那里炸得千疮百孔。 10月11日 GSM 900/1800 Pricinple1. In order to achieve actually a real capacity increase when integrating GSM-1800 frequencies in a GSM-900 system a new mobile type has been specified in the GSM standard, the multiband Mobile Station (MS), with the capability to operate in both frequency bands;
2. a multiband-terminal user will not be aware of the selected frequency band as all multiband-specific actions will be carried out by the network with assistance of the mobile terminal. These actions cover mainly the cell-selection and handover process;
3. In order to assure backward compatibility to all GSM mobile terminal types the system treats each terminal with respect to its capabilities independently. Single-band mobile terminals, either GSM 900 or GSM 1800, will be served as in a pure GSM-900 or GSM-1800 network, respectively;
4. In the Alcatel-Lucent realization of multiband operation the BSC serves in parallel BTSs using either the GSM-900 or GSM-1800 band. Operation and maintainance of both BTS types can be performed by one OMC-R. The MSC is not affected by this function as it has only to transmit the relevant information transparently from one BSS to another;
5. The BSC is in charge of allocating the appropriate resources. It is informed about the frequency bands supported by connected and neighbour BTSs and the capabilities of served mobile terminals. Based on this information the BSC manages the broadcasting of multiband information in each cell and the signalling to each mobile;
6. Via one OMC-R several multiband BSSs can be managed. At the OMC-R GSM-900 and GSM-1800 cells can be configured and controlled. Beside the multiband-specific functions the OMC-R handles both cell types in the same way;
7. Single-band terminals, i.e. supporting exclusively either GSM-900 or GSM-1800 band, will not indicate their frequency capabilities explicitly to the network;
8. Multiband terminals indicate their multiband capabilities in the 'Mobile Station Classmark 3' information. It includes the frequency bands supported by the mobile terminal, i.e. GSM 900 and GSM 1800, and the respective power classes;
9. The multiband information will be sent by multiband terminals in the first connection phase, but after call set-up time, using the classmark-change message;
10. In the initial phase of a connection the network has no information on the terminal's multiband capabilities. During this first period a multiband terminal cannot be distinguished from a single-band terminal, so that all accessing mobile terminals are treated as single-band terminals until they indicate anything else;
11. When an inter-BSC handover takes place, the target BSC is informed about the terminal capabilities by the respective MSC;
12. The information of the neighbour-cell BCCH frequencies used by the terminals for cell re-selection and measurement reporting purposes are indicated respectively in the BCCH channel and in a dedicated channel on a per-call basis;
13. For this signalling purpose the System-Information type-2 family (SI 2) on the BCCH and the System-Information type-5 family (SI 5) on the SACCH are used;
14. In contrast to single-band terminals multiband terminals can observe neighbour cells of different frequency bands. As a consequence multiband terminals will report a mixture of GSM-900 and GSM-1800 cells. Up to six neighbour cells can be reported;
15. Normally a mobile terminal reports the strongest neighbour cells measured irrespective of their supported frequency band. To ensure that handover is possible, e.g. for traffic reasons, to a cell not reported to be the strongest candidate, multiband terminals can be caused by the network to report at least an indicated number of strongest cells of each frequency band;
16. The general principle of Alcatel-Lucent's multiband radio link control is to use as much similarities of GSM 900 and GSM 1800 as far as the operation in one frequency band is concerned;
17. The power control algorithm for GSM 900 and GSM 1800 is adapted to the power classes of the respective mobile terminals. According to the GSM standard five GSM-900 and three GSM-1800 power classes will be supported;
18. The objective of Alcatel-Lucent's multiband-handover concept is to provide in a first step a basic mechanism to handle overlaid multiband cells;
19. It is considered that the capacity of an operational GSM-900 network is going to be extended by introduction of GSM-1800 cells. Cells in the GSM-1800 band will be used to carry traffic when GSM-900 cells are going to be congested;
20. In order to support the function to direct multiband terminals into the 'preferred band' a new handover cause is defined. A handover from the serving cell to a cell in the preferred band is triggered, when the traffic load in the serving cell exceeds a certain limit and the receive level in the potential target cell is sufficient high;
21. Preferred-band handover
LOAD(0) > Multiband_Load_Level and there is a neighbour cell n in the preferred band, with AV_RXLEV_NCELL(n) > L_RXLEV_OCHO(n) + max(0, [MS_TXPWR_MAX(n)-P]) and EN_PREFERRED_BAND_HO = ENABLE |
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