问题 问答题 简答题

列出至少5条TD-LTE容量性能提升策略。(可从业务面控制面来分析)

答案

参考答案:

业务面容量改善策略:

1、扩充系统带宽,考虑同频组网,合理利用频率资源

2、根据业务需求配置上下行时隙比例

3、采用高性能的多天线技术

4、优化天线自适应算法,采用SDM方式支持中心用户获得高速率体验,采用SFBC或BF方式提升边缘用户的吞吐量;采用MU-MIMO方式,提升小区吞吐量;eNB采用8天线配置

5、采用高效合理的调度策略,支持边缘用户提升速率

控制面容量提升策略:

1、增加系统带宽,扩充频点数目

2、抑制控制区域小区间干扰可支持更多的同时调度用户:下行采用功率分配,上行采用功率控制;采用发射分集技术,增强信号接收

阅读理解

I recently ran into a friend I hadn't seen for a long while.  Our conversation was lively andfull of news from both sides.  Before we parted she said  "You'll have to drop in sometime. "immediately  sensed that if I  simply  " dropped in"  I would take my friend by  surprise, and  I would be discouraged by the image of her standing in her doorway, staring at me, and asking, " Oh ,err …what brings you here?"

Whatever happened to the unannounced drop-in visit? When I was growing up in the 1960s, it seemed that people-mostly relatives,  but also friends-were always dropping in .  My parents would put coffee on, and my mom would find something in the kitchen to serve along with it. Then the conversation would begin…The neighbor lady, a worrier, was unloading her sadness while my mom quietly listened. The Irish man next door had such an atcent that I remember asking what language he spoke. My Polish relatives arrived in packs…But I never heard my parents say any- thing like  " We  weren't expecting you"  or  " This  isn't a good  time.  " Drop-in  visitors  had  a certain right of way and became No. 1.

What happened to such visits? Actually I know the answer. Times have changed. Everybody gets busy with work. There is no longer a stay-at-home mom keeping a pot of hot coffee or tea ready throughout the day for a surprise guest. Exploding malls and stores are now replacing homes as a central form of entertainment.

Just the other day a former student of mine showed up.  "I'm sorry for the surprise visit. " my student began.  "I just wanted to see if you still lived here.  I'll only stay a minute. "

My response was immediate.  "No, you won't," I said.  " Just come in, sit, have coffee, and we'11 talk. "I had nothing in the kitchen but we ordered pizza.  And we had a lovely time.  I have tried to keep the drop-in tradition alive though it takes some effort.

小题1:The author thought of his friend's invitation- " You'll have to drop in sometime"-as______

A. a nice way of refusal

B. an excuse of leaving

C.a kind of politeness

D.an expression of surprise小题2:The underlined phrase "dropping in" in the second paragraph means_________.

A.pay a sudden visit

B.make many friends

C.make a special date

D.have a good time小题3:The woman from the neighborhood used to visit the author' s home to _______.

A.seek comfort from my parents

B.make nevr friends

C.listen to my parents' story

D.taste nice dishes小题4:From the third paragraph of the passage, we can infer that_______.

A.unexpected visitors are still welcome now

B.modern people prefer outdoor activities

C.there are more jobs for the housewives now

D.the author misses the lost good days小题5:The author writes the passage intending to ________.

A.encourage people to be drop-in visitors

B.explain how to deal with unexpected visitors

C.share his feelings about the drop-in tradition

D.show the importance of making friends

单项选择题 A1型题