The meeting of the rubber-stamp body will also take place just two days before deceased founder Kim Il-Sung's 100th birthday and will be the first under new leader Kim Jong-Un.
Pyongyang's official Korean Central News Agency (KCNA) said the Supreme People's Assembly (SPA) would convene on April 13.
The assembly is constitutionally able to appoint the chairman of the National Defence Commission (NDC), a top military decision-making body wielding great influence over the highly militarised communist state.
The parliament would likely promote Jong-Un, currently vice chairman of the commission, to the NDC's highest post, which was held by his father Kim Jong-Il, who died in December from a heart attack, analysts said.
Separately, the North's ruling communist party last month said it would convene a rare special conference in April on an unspecified date in an apparent attempt to wrap up the power transfer to the new leader.
The party meeting is likely to appoint Jong-Un to his father's old posts of party general secretary and chief of its Central Military Commission, analysts said.
Jong-Un has been proclaimed the "great successor" but has so far been formally appointed to only one of the late Kim's posts, commander-in-chief of the 1.2 million-member military.
North Koreaannounced earlier this month it would launch a rocket between April 12-16 to put a satellite into orbit to celebrate the centenary of Kim Il-Sung's birth.
The move has been condemned by theUnited States,South Koreaand other nations as a pretext for a long-range missile test banned by the UN.
It has also jeopardised a deal with theUnited Statesannounced last month on suspending uranium enrichment and long-range missile tests in return for food aid.
A seniorUSofficial warned that the rocket launch would be aimed south for the first time and impact in an area "roughly betweenAustralia,Indonesiaand thePhilippines".
Kurt Campbell, the assistant secretary of state for East Asian and Pacific affairs, delivered the message in person to Australian Foreign Minister Bob Carr, the Sydney Morning Herald reported Saturday.
"We have never seen this trajectory before," he was quoted as saying.
On Friday, the North said preparations "have entered a full-fledged stage of action" and promised unspecified "counter-measures" against opponents of the operation.
Tokyoannounced the same day it was readying its missile defences to shoot down the rocket if it threatensJapan.North Korea's main allyChinaurged "all parties should keep calm and exercise restraint".
Professor Yang Moo-Jin of theUniversityofNorth Korean StudiesinSeoulsaid that "the rocket launch and parliamentary and party meetings are all part of the North's plan to usher in a new era under Jong-Un."
"It will declare it has become 'a strong and prosperous state' on the 100th anniversary," he said.
World leaders includingUSPresident Barack Obama are meeting inSeoulin the coming week for a summit officially focused on nuclear terrorism.
UN Secretary General Ban Ki-moon plans to raise the rocket launch on the sidelines of the meeting on Monday and Tuesday.