Cell Breathing

Cell breathing (telephony) From Wikipedia, the free encyclopedia In CDMA-based mobile telephone systems, cell breathing

Views 162 Downloads 21 File size 210KB

Report DMCA / Copyright

DOWNLOAD FILE

Recommend stories
Breathing
Breathing

BREATHING EXERCISES FOR BRASS PLAYERS TO DEVELOP EFFICIENCY, FLEXIBILITY AND COORDINATION Donald C. Little Regents Profe

5 0 52KB Read more

condense breathing
condense breathing

IKF Condensing Breathing Article v.2.3 A few years ago, when Dave Cater asked me to write an article entitled, TEN MINUT

57 7 1MB Read more

Breathing Gym
Breathing Gym

86 3 5MB Read more

Breathing Gym
Breathing Gym

124 2 18MB Read more

Cell Injury and Cell Death
Cell Injury and Cell Death

126 1 3MB Read more

Outokumpu Cell
Outokumpu Cell

OK-R and OK-U Conventional Outokumpu flotation cells Optional cells for smaller tank volumes The Outokumpu partnership

107 0 413KB Read more

The Cell
The Cell

14 3 166KB Read more

The Breathing Gym.pdf
The Breathing Gym.pdf

21 0 16MB Read more

Ki Breathing Translation
Ki Breathing Translation

Table of Contents Table of Contents ....................................................................................

0 0 946KB Read more

Breathing Brochure II
Breathing Brochure II

Victorious Breath (Ujyaii Pranayama) Benefits: Heating and detoxifying. Increases alveolar ventilation and improves exha

39 0 67KB Read more

Citation preview

Cell breathing (telephony) From Wikipedia, the free encyclopedia

In CDMA-based mobile telephone systems, cell breathing is a mechanism which allows overloaded cells to offload subscriber traffic to neighbouring cells by changing the geographic size of their service area. Heavily loaded cells decrease in size while neighbouring cells increase their service area to compensate. Thus, some traffic is handed off from the overloaded cell to neighbouring cells, resulting in load balancing

Soft handoff In cellular telephone communication, soft handoff refers to the overlapping of repeater coverage zones, so that every cell phone set is always well within range of at least onerepeater (also called a base station). In some cases, mobile sets transmit signals to, and receive signals from, more than one repeater at a time. Soft handoff technology is used by code-division multiple access (CDMA) systems. Older networks use frequency division multiplex (FDM) or time division multiplex (TDM). In CDMA, all repeaters use the same frequency channel for each mobile phone set, no matter where the set is located. Each set has an identity based on a code, rather than on a frequency (as in FDM) or sequence of time slots (as in TDM). Because no change in frequency or timing occurs as a mobile set passes from one base station to another, there are practically no dead zones. As a result, connections are almost never interrupted or dropped.

What is Cell Breathing and why? The cell coverage shrinks as the loading increases, this is called cell breathing. In the uplink, as more and more UE are served by a cell, each UE needs to transmithigher power to compensate for the uplink noise rise. As a consequence, the UEwith weaker link (UE at greater distance) may not have enough power to reach theNodeB – therefore a coverage shrinkage. In the downlink, the NodeB also needs to transmit higher power as more UE arebeing served. As a consequence UE with weaker link (greater distance) may not bereachable by the NodeB.